Document Sample

```					Tens and ones structure of 2-digit numbers         In-class                   Activity 1
Activity              Bus settings to 100
Source                Green Bk. P.194
Class                 1st/2nd
Stage                 SEAL Stage 3-5          Tens and Ones, Level 2-3
Term                  Term 2/3
Curriculum            Explore, identify and record place value 0-199
objectives
Object of Activity    The ten frame (tens bus) is used to build tens and ones knowledge to 100 and
MR aspect             Key Topic 8.4 Adding and Subtracting to and from Decade Numbers

Materials              Bus transparency for overhead projector or whiteboard, bus cards, bus activity log
sheet.

Procedure                  1) Begin by counting forwards and backwards in tens.
2) Count forwards in tens off the decade e.g. 28, 38 etc.
3) Display a ten frame bus. How many people can fit on the bus? How many
spare seats are there?
4) Display two full tens buses. How many people are there on these buses?
5) Flash combinations of people on the two buses (one full and one partly
filled). How many people are on the bus?
How many spare seats are there?

1) How many tens buses?
Each child/pair has 10 full tens buses and a set of buses containing 1 to 9
passengers.
Make 45. How many full buses are needed for 45 passengers? ‘4 tens
buses’, how many people are on those full tens buses?- ‘40’. Let’s count
them together 10,20,30,40.
How many people are on the bus that isn’t full? ‘5'

2) Bus snap
One Player has a set of bus cards- card with some full and some partially
full buses.
Player two has numeral cards which match the number of passengers on
the bus.
Players take turns to place a cards down and try to identify snap.

Notes                  Link to language of tens and units- see below.
Symbols/Recording      This can be linked to identifying the number of tens and units in a number. When
talking about how many tens make 45 – fill in the numbers as 4 tens, and the
partially full bus is termed the units/ones. 45 is make of 4 tens and 5 units/one
which is 40 and 5.
Modify/Extend          Write Activity 1 as missing addend/subtrahend.
Adapt Activity 2 as a whole class matching game by placing the cards on the
whiteboard.
Tens and Ones structure of 2-Digit Numbers          In-class        Activity 2
Activity              Blank 100 square
Source                Green Bk. P.197
Class                 1st/2nd
Stage                 SEAL Stage 3- 5          Tens and Ones, Level 2-3
Term                  Term 2/3
Curriculum            Explore, identify and record place value 0-99
objectives
Object of Activity    To build numeral identification and number sequences to 100.
MR aspect             Key Topic: Numerals from 1 to 100
Materials             Blank 100 square for overhead projector/whiteboard; blank 100 square for
children; full 100 square transparencies for children to check their work.
Screens to hide columns on 100 square.
Procedure                     Activity 1
Show one column on the 100 square. Hide some numbers. Children are
required to count in tens to identify the missing numbers.
Activity 2
An empty hundred square is displayed on the overhead
projector/whiteboard. Who can tell us how they would find where 27
would be? A child is chose to write in the number 27 in the correct
location. Who can tell us where 37 would be? Methods for locating this
number are discussed. A child is selected to write this number in the
correct location. Who could tell us where 57 would be? Where would 17
be? Continue until all the spaces in the 7 column are filled.
Activity 3
Each individual (or pair) has a blank hundred square and a transparent
complete hundred square.
Teacher randomly selects a numeral from a set of numerals 1-100
(for example 45): Write forty-five on your blank hundred square.
Children writes 45 on their blank hundred squares.
The teacher selects other numerals at random and children write these on
their hundred squares.
Overlaying a transparent 100 square allows for checking of these.
The class discuss and compare their strategies.

Notes
Symbols/Recording     Use PV cards and show numbers on ENL

Modify/Extend         100 square can start at 100 as children’s knowledge of NWS increase
Tens and Ones structure of 2-Digit Numbers           In-class             Activity 3
Activity              100 square Activities 2
Source                Green Bk. P.198
Class                 1st/2nd
Stage                 SEAL Stage 3-5             Tens and Ones, Level 2-3
Term                  Term 2/3
Curriculum            Explore, identify and record place value 0-99
objectives
Object of Activity    To build numeral identification and number sequences to 100.
MR aspect             Key Topic 7.2: Numerals from 1 to 100
Materials             Blank 100 square for overhead projector/whiteboard; blank 100 square for
children; full 100 square transparencies for children to check their work.
Screens to hide columns on 100 square.
Activity1- Get ten
A child selects a numeral from the container and places this on the blank hundred
square. Alternatively, this could be written on the blank hundred square if a
permanent copy of the activity is required. The other child then selects a numeral
and places it on his/her blank square.
This is repeated a set number of times (e.g. 10).
Children each check the placement of their numerals using the transparent
hundred square.

Activity 2 –Find the Target Number
On a blank hundred square, each player chooses a number and writes it in the
correct location without showing the other player. This is the target number and it
is circled in red.
The aim of the activity is for each player to discover the other player’s target
number.
The first player makes a guess e.g. 27. The other player states whether the target
number is lower, higher or equal to the player’s guess. Players keep track of these
responses by writing their guesses on their bland hundred squares, and arrows are
used to indicate whether the target number is higher or lower than the guess.
The game proceeds until one player or both players guess the other’s target
number.

Activity 3 –Partial Hundred Square
Part of the hundred square is shown on a sheet (or on a card). Children
individually or in pairs fill in the remaining squares.

A hundred square is displayed on the overhead projector. The square is screened
by a cover with a hole displaying only one number.
Possible tasks- Teacher points to the position directly below the visible numeral
and asks: What number is this? What is the number to the right of the number
below the number we can see?
Notes
Symbols/Recording      Use Place value cards/ENL
Modify/Extend   Activity 1Children add the numbers they have in their correct locations.
Three in a row: The game continues until three numerals in a row/column have
been achieved e.g. 65,75,85
Tens and Ones structure of 2-Digit Numbers                 In-class              Activity 4
Activity              Empty Number Line

Source                Green Bk. P.227
Class                 2nd
Stage                 SEAL Stage 3-5           Tens and Ones, Level 3
Term                  Term 2/3
Curriculum            Add numbers without and with renaming, within 99.
objectives
Object of Activity    Assisting children to develop sophisticated addition and subtraction strategies by
the use of the empty number line.
MR aspect             9.2 Two digit addition and subtraction through counting
Materials             Pink cards, blue cards and log sheet
Procedure             Whole class/pairs:
1. On the whiteboard/overhead projector, the teacher draws the solutions to
class what the question was and how the children solved it.

2. Using ten frames (or ten strips) display and screen 48 dots. Here are 48
dots. Place another 24 dots next to them. How many dots are there
altogether? Let’s try to look at different ways of working it out.

Ask children to tell how they solved this task. As solutions are given the
teacher uses the empty number lines to map strategies. Below are some
examples of child strategies.

3. Using ten frames (or ten strips) display and screen 64 dots. Here are 64
dots. Remove 25 dots. I’ve taken out twenty-five dots, how many are left?
Ask children to tell how they solved this task. As solutions are given the
teacher uses empty number lines to map the strategies.
Some possible child strategies are shown below.

Notes                 Discuss the different alternative strategies. Highlight the use of non count-by-ones
Symbols/Recording     Write the calculation in horizontal form using addition/subtraction signs.
Tens and Ones structure of 2-Digit Numbers                In-class    Activity 5
Activity              Empty Number Line game 2

Source               Green Bk. P.229
Class                1st /2nd
Stage                SEAL Stage 3-5          Tens and Ones, Level 3
Term                 Term 3/2
Curriculum           Add numbers without and with renaming, within 99.
objectives
Object of Activity   Assisting children to develop sophisticated addition and subtraction strategies by
the use of the empty number line.
MR aspect            9.2 Two digit addition and subtraction through counting
Materials            Pink cards, blue cards and log sheet. Pink cards have numerals from 40 to 60. Blue
cards have numerals from 11 to 39.
Procedure            Whole class/pairs:
Activity 1-How many?
Children in pairs take turns to select a pink card and write the numeral displayed
on the log sheet. These numbers are added using an empty number line which is
drawn on the log sheet. The winner of each round is the player with the largest
number. The best of five rounds wins.
Player Pink     Blue Total
card     card
50          32
1        50     32     82

Activity 2- ENL concentration
Children play in pairs or threes.
The pink and blue cards are laid out in separate rows, face down. Player 1 turns up
a pink card and then turns up a blue card to try and find the match. If the cards
match the player keeps them, if not they are turned back face down.

82

Notes
Symbols/Recording    Write the calculation in horizontal form using addition/subtraction signs on a log
sheet.

Modify/Extend        Use subtraction calculations.
Use calculations involving regrouping.

On the board draw some of the strategies and discuss the merits/alternative
strategies.
Tens and Ones structure of 2-Digit Numbers                In-class    Activity 6
Activity              Leap frog
Source                Purple Bk. P.134
Class                 1st/2nd
Stage                 SEAL Stage 3-5          Tens and Ones, Level 3
Term                  Term 3/2
Curriculum            Add numbers without and with renaming, within 99.
objectives
Object of Activity    To develop knowledge of 2-digit addition and subtraction with and without
regrouping
MR aspect             9.2: Two- Digit Addition and subtraction
Materials             Leap Frog game board. Spinners (see Fig 8.3 and 8.4), pencil, scrap paper for
Empty number line, different colour counters for each team.
Procedure             A Leap Frog game board and special spinners are used to generate mixed addition
and subtraction problems.

1. Practice counting up and down in tens on/off the decade with the whole
class.
2. Player 1 spins to create an addition and subtraction problem.
3. The player states the number sentence and places the counter on the
4. Next player takes turn.
5. Players take turns until one player has three counters in a row.

Notes                 Leap Frog A- does not involve regrouping.
Leap Frog B- some of the problems involve regrouping.
The player may use an empty number line or number chart to solve the problem.
Symbols/Recording     Write the calculation in horizontal form using addition/subtraction signs on a log
sheet.

Modify/Extend         Discuss other possible strategies.
Spinners can be differentiated to suit learning needs.
Tens and Ones structure of 2-Digit Numbers                 In-class     Activity 7
Source                Including Lower achievers in the Maths lesson p.27
Class                 1st 2nd
Stage                 SEAL Stage 3-5             Tens and Ones, Level 3
Term                  Term 3/2
Curriculum            Add numbers without and with renaming, within 99.
objectives
Object of Activity    To add or subtract 11 from any 2-digit number.
MR aspect             9.2: Two- Digit Addition and subtraction
Materials             Add or subtract 11 game board, Special spinner,
Procedure                  1. With the whole class practice adding 10 to a number and jumping back
one. Illustrate using the Empty Number line.
2. Physically demonstrate this by getting the children to take a large jump
forward i.e. jump of ten and then a step backwards to show
compensation.
3. Play Bingo- spinner divided into 9 and 10. Fill in numbers from 32- 42 on
second spinner. Cross of numbers – first player who gets three in a row
wins.

Notes                  Children need to be able to add ten to any number before using it as a basis for
Game can be played with the whole class by using an enlarged game pboard. Class
is divided into ‘x’ and ‘o’ teams.
Symbols/Recording      Write the calculation in horizontal form using addition/subtraction signs on a log
sheet.
Record compensation using the Empty number line.

Modify/Extend          Discuss other possible strategies.
Spinners can be differentiated to suit learning needs.
Tens and Ones structure of 2-Digit Numbers                In-class   Activity 8
Source                Purple Bk. P.137
Class                 1st /2nd
Stage                 SEAL Stage 3-5         Tens and Ones, Level 3
Term                  Term 3/2
Curriculum            Add numbers without and with renaming, within 99.
objectives
Object of Activity    To add or subtract 11 from any 2-digit number.
MR aspect             9.2: Two- Digit Addition and subtraction
Materials             Add or subtract 11 game board, paper clip and pencil, Special spinner – see Disc
accompanying Purple book for materials
Procedure             Use the Add or Subtract game board and special spinners to generate problems
with addends and subtrahends of 11.

1. Practice counting up and down in tens on/off the decade with the whole
class.
2. Player A spins to create an addition or subtraction problem. This player
states the number sentence and places a counter on the answer. An
empty number line can be used to solve the calculation.
3. Player B repeats the problem.
4. Play continues until one player gets 3 numbers in a row.

Notes                  This can be adapted to a whole class game by placing a large game board on the
whiteboard, dividing the class into two teams ‘x’ and ‘o’, and moving through the
class with the spinners.
Symbols/Recording      Write the calculation in horizontal form using addition/subtraction signs on a log
sheet.

Modify/Extend          Discuss other possible strategies.
Spinners can be differentiated to suit learning needs.
Tens and Ones structure of 2-Digit Numbers                In-class    Activity 9

Source                Including Lower Achievers in the Maths lesson Chapter 3 p.27
(Maureen Nixon and Sue Atkinson)
Class                 1st/2nd

Stage                 SEAL Stage 3-5         Tens and Ones, Level 2,3
Term                  Term 3
Curriculum            Add numbers without and with renaming, within 99.
objectives
MR aspect             9.2: Two- Digit Addition and subtraction
Materials             Spinner marked 10,20,30,40,50,60,70,80,90
Dice marked 1 to 3
Bingo grid (off decade numbers 11-93 – all numbers end in 1,2 or 3)
Procedure                  1. Player rolls dice and gets a number 1 to 3
2. Player then spins and gets a decade number
3. Player adds the numbers and marks the corresponding number on the
bingo grid if possible.
4. Next Player takes their turn. Winner gets 3 in a row first.
Notes                 Game can be played with the whole class by using an enlarged gameboard. Class is
divided into ‘x’ and ‘o’ teams.
Symbols/Recording     Write the calculation in horizontal form using addition/subtraction signs on a log
sheet.
Record using the Empty number line.

Modify/Extend         By adapting the bingo grid the game can be changed to subtraction.
Spinners can be differentiated to suit learning need
Tens and Ones structure of 2-Digit Numbers              In-class    Activity 10

Activity              Add to, or Subtract from 49
Source                Purple Bk. P.138
Class                 1st/2nd
Stage                 SEAL Stage 3-5         Tens and Ones, Level 3
Term                  Term 3/2
Curriculum            Add numbers without and with renaming, within 99.
objectives
MR aspect             9.2: Two- Digit Addition and subtraction
Materials             Add or subtract 49 game board, Special spinner
Procedure             Use the Add or Subtract game board and special spinners to generate problems
Tens and Ones structure of 2-Digit Numbers                  In-class     Activity
11
1. Practice counting up and down in tens on/off the decade with the whole
class.
Activity             How many more?
2. Player A spins to create an addition or subtraction problem. This player
states the number sentence and places a counter on the answer. An
Source               Green Bk. P.227
empty number line can be used to solve the calculation.
Class                2nd 3. Player B repeats the problem.
Stage                                     Tens and Ones, Level
SEAL Stage 5continues until one player gets33 numbers in a row.
4. Play
Term                 Term 3
Curriculum           Add and subtract with and without renaming, within 999.
objectives
Notes                This can be adapted to a whole class game by placing a large game board on the
Object of Activity   To assist children to develop sophisticated strategies ‘o’,add and subtract three-
whiteboard, dividing the class into two teams ‘x’ and to and moving through the
digit numbers.spinners.
class with the
Symbols/Recording    Write the calculation in horizontal form using addition/subtraction signs on a log
sheet.

Modify/Extend        Discuss other possible strategies.
Spinners can be differentiated to suit learning needs.
MR aspect           9.1 Counting by 10s and 100s
Materials           Blank 100 square for overhead projector/whiteboard; blank 100 square for
children; full 100 square transparencies for children to check their work.
Screens to hide columns on 100 square.

Procedure           Pairs of children/ Whole class:
Have cards with numerals from 100 to 1,000. The cards are placed in a stack in
between the players.
Children select the top card and work out how many more are needed to get to
the next hundred.
If required, the numbers and the children’s answers can be logged on a record
sheet.
Child/Team closest to the next 100 can receive a point.

Notes               Discuss how children came up with their answers
Symbols/Recording   Show jumps on ENL/write as missing addend.

Modify/Extend       Without material, ask the class to solve tasks such as: If I have 347, how many
more do I need to make 400?
Tens and Ones structure of 2-Digit Numbers                In-class     Activity 12

Source                Purple Bk. P. 140
Class                 1st/2nd
Term                  3/2
Stage                 SEAL Stage 3-5         Tens and Ones, Level 3
Curriculum            Add and subtract with and without renaming, within 999.
objectives
Object of Activity    To add two 2-digit number using the jump method and the Empty Number
Line to record the strategy.
MR aspect             2- digit addition and subtraction through counting
Materials             100 square spinner
Procedure             Partners/teams
1. Use the 100 square and spinners to generate 2-digit addition
problems. Record each problem that is generated as a separate
horizontal number sentence.
2. Player A places marker on 1. Each spinner is spun to make the
number that is to be added. The number Player A is on and the
number spun are recorded. Use the jump method to move the
marker to find the sum. The sum of the two numbers is recorded.
3. Player B repeats these steps.
4. Players alternated turns until both players have reached at least 100
e.g. Player A is on 23 and spins 30 and 4 record as 23 + 34.
Player A works out the sum mentally and uses an ENL to record the
strategy.
Notes                 Use with whole class by splitting the class into teams and displaying a large
100 square on the board.
Symbols/Recording     Writing sums in horizontal form in addition to recording on the ENL
Modify/Extend         Use numbers beyond 100
Tens and Ones structure of 2-Digit Numbers                In-class     Activity 13

Activity              Jump from 100

Source                Purple Bk. P. 140
Class                 1st/2nd
Term                  3/2
Stage                 SEAL Stage 3-5         Tens and Ones, Level 3
Curriculum            Add and subtract with and without renaming, within 999.
objectives
Object of Activity    To subtract a 2-digit number using the jump method with the support of the
number chart
MR aspect             2- digit addition and subtraction through counting
Materials             100 , spinner
Procedure             Partners/teams
1. Use the 100 square and spinners to generate 2-digit addition
problems. Record each problem that is generated as a separate
horizontal number sentence.
2. Player A places marker on 1. Each spinner is spun to make the
number that is to be subtracted. The number Player A is on and the
number spun are recorded. Use the jump method to move the
marker to find the solution. The difference of the two numbers is
recorded.
3. Player B repeats these steps.
4. Players alternated turns until both players have reached at least 100
e.g. Player A is on 58 and spins 30 and 4.
Start at 58 and jump up 3 rows and left 4 columns. Record as 58-
34=24.
Notes                 Use with whole class by splitting the class into teams and displaying a large
100 square on the board.
Symbols/Recording     Writing sums in horizontal form in addition to recording on the ENL
Modify/Extend         Use an Empty Number line
Use numbers beyond 100
Tens and Ones structure of 2-Digit Numbers                In-class     Activity 14

Activity              Calculator Challenge

Source                Purple Bk. P. 140
Class                 2nd
Term                  3
Stage                 SEAL Stage 3-5         Tens and Ones, Level 3
Curriculum            Add and subtract with and without renaming, within 999.
objectives
Object of Activity    To solve problems involving 2-digit addition and subtraction with missing
MR aspect             2- digit addition and subtraction through counting
Materials             Calculator, paper and pencil
Procedure             Whole class, small groups, pairs, individuals
1. The teacher instructs the children to enter a number into their
calculator (e.g. 54). Then tells them a new target number (e.g. 34).
2. Their challenge is to add/subtract from the original number to show
34 on the screen.
3. The child/team who reaches the new target number by pushing the
least number of keys wins the challenge.
Notes
Symbols/Recording     The beginning number and target numbers can be on a worksheet where the
children record the keys pressed to get the answer.
Modify/Extend         Children can only add or subtract 10 or 1.
Tens and Ones structure of 2-Digit Numbers               In-class    Activity 15

Activity              Target Number

Source                Purple Bk. P. 141
Class                 1st/2nd
Term                  3/2
Stage                 SEAL Stage 3-5         Tens and Ones, Level 3
Curriculum            Add and subtract with and without renaming, within 999.
objectives
Object of Activity    To solve problems involving 2-digit addition and subtraction with missing
MR aspect             To jump by tens on a hundred square.
Materials             100 squares for children,100 square transparency, paper and pencil
Procedure             Whole class, small groups, pairs, individuals
1. Hundred square is placed on whiteboard/overhead projector.
2. The teacher selects a target number e.g. 53 and places a mark on the
square.
3. The teacher then selects a new target number.
4. Different strategies are suggested by students on how to get to the
target number.
5. Children can try out the strategies on their own 100 squares. b
Notes
Symbols/Recording     The beginning number and target numbers can be on a worksheet where the
children record the keys pressed to get the answer.
Modify/Extend         Children can only add or subtract 10 or 1.
Tens and Ones structure of 2-Digit Numbers               In-class    Activity 16

Source                Purple Bk. P. 141
Class                 1st/2nd
Term                  3/2
Stage                 SEAL Stage 3-5         Tens and Ones, Level 3
Curriculum            Add and subtract with and without renaming, within 999.
objectives
Object of Activity    To practice forward and backward number word sequences by ten on and
MR aspect             Incrementing and decrementing by tens and ones
Materials             None
Procedure             Whole class/small group
1. The teacher begins the activity by roaming about the room while
saying the number word sequence aloud. At some point, she taps a
child on the shoulder. The child then picks up the sequencing and
wandering. When the teacher says Stop the child then taps another
child who continues.
Notes                  This activity can be done with any number sequence
Symbols/Recording     Write the sequences on a board when finished.
Modify/Extend         Extend the sequence beyond 100.
Tens and Ones structure of 2-Digit Numbers                In-class     Activity 16

Activity              Bead string with ten catcher

Source                Purple Bk. P. 136
Class                 1st/2nd
Term                  3/2
Stage                 SEAL Stage 3-5         Tens and Ones, Level 3
Curriculum            Add and subtract with and without renaming, within 999.
objectives
Object of Activity    To add ten and tens to any number
MR aspect             Incrementing and decrementing by tens and ones.
Materials             100 Bead string, cloth or tube for cover
Procedure             Whole class, small groups, pairs, individuals
1. Use a bead string with alternating colours for each set of 10 beads.
2. Briefly show the first collection and then cover with a tube or piece
of cloth.
3. Use a ten catcher to slide a second collection beside the first.
altogether?

Notes                 If you do not have a ten catcher move ten beads manually- it is important to
move the beads as a group of ten.
Symbols/Recording     Record the calculations on a whiteboard.
Model children’s thinking on a ENL
Modify/Extend         Both collections can be screened.
Tens and Ones structure of 2-Digit Numbers                In-class     Activity 17

Activity              100 square race

Source                Purple Bk. P. 136
Class                 1st/2nd
Term                  3/2
Stage                 SEAL Stage 3-5         Tens and Ones, Level 3
Curriculum            Add and subtract with and without renaming, within 999.
objectives
Object of Activity    To add ten and tens to any number
MR aspect             Incrementing and decrementing by tens and ones.
Materials             100 square, spinner marked 10,10,1,1, counters of different colours
Procedure                 1. Two children share a 100 square.
2. Each child has a counter. Children roll a dice to see where they will
start from on the first row. Children take turns to spin the spinner
and move the correct number of spaces.
3. When they reach the bottom row they stop spinning and wait until
their partner reaches the bottom row too. The winner has the
number closest to 100.

Notes
Symbols/Recording     Record calculations.
Modify/Extend         Use a blank 100 square.
Tens and Ones structure of 2-Digit Numbers                    In-class   Activity 18

Activity              Stick spinner games to 100

Source                Purple Bk. P. 136
Class                 1st/2nd
Term                  3/2
Stage                 SEAL Stage 3-5         Tens and Ones, Level 3
Curriculum            Add and subtract with and without renaming, within 999.
objectives
Object of Activity    To add ten and tens to any number
MR aspect             Incrementing and decrementing by tens and ones.
Materials             Spinner marked 1,1,2,10,10,20
Bundles of sticks
Procedure                 1. Game 1
Children take turns to spin the spinner. They take the correct
number of sticks and give their total after each turn. See who has the
most after 5 throws

2. Game 2
Make a hundred. Children take turns to roll a 1-6 dice. Whatever
number they get they can choose to have that many bundles (10
sticks) or sticks. After 5 throws whoever has the nearest to 100 wins.
If you have more than 100 you lose.
Notes
Symbols/Recording     Record calculations.
Modify/Extend         Use place value cards for activity 2.
Activity 1- Bus settings to 100
Activity 6 Leap Frog A- no regrouping
Activity 6 Leap Frog B- regrouping

Insert spinner divided into 9 and 10. Insert blank spinner. Insert 5x 5 blank bingo grid.

Activity 9
Insert Spinner marked 10,20,30,40,50,60,70,80,90

Activity 12/13
Insert 100 square and spinner 1-6 and spinner 10,20,30,10,20,30

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