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```					The Power of Decimals

1
Introduction

Instructions:
1) Read each slide carefully. Remember, you are
responsible for this information!
2) If you wish to go back, click the back arrow
3) Answer the questions at the end of each section.
This will allow you to move on to the next question
4) Have fun!

2
Introduction to decimals

 Decimals are used to show PART of a whole number

 Partial numbers fall to the right of the DECIMAL
POINT

Whole
1.5                    Partial number

number

3
Place names

The farther right the decimal
place, the smaller size.
 See labels below

2.89
Hundreths
Ones                          (smallest)
(small)           Tenths
(smaller)
4
Fractions and Decimals

All fractions can be converted into decimals
(Some look messier than others.)

Examples

½= 0.5                      1/10= 0.1
1/4= 0.25             1/7= 0.14285
5
Question 1

2.63
Which number is in the hundredths place ?
1.   2
2.   3
3.   6
4.   0

6
Incorrect

Remember:
The farther right, the smaller the number

Try again

7
Correct!

Exactly! 3 is the hundredths place. It has the smallest
value because it is farthest right

8
Ordering decimals

To put decimals in numerical order:

Work left to right!!
Once you find the higher number, stop!
Example
Not
needed

same                     same
Smaller!
Bigger!               Stop!
Stop!            9
Ordering decimals

10
Which number is bigger?

1.   2.39
2.   2.48
3.   2.47
4.   2.36
5.   2.43890798698
11
Incorrect

 Remember, work left to right. Click here to double
check the slide.

 Try again?

12
Correct!

Exactly. 2.48 is the largest of the numbers

13
Which number is smaller?

A. 8
B. 8.1
C. 8.15
D. 8.155

14
Sorry, not quite!

If no decimal is present, it is the same as zero.

15
Exactly!

 Since the first numbers are the same, 8 is the smallest
because it has no decimals

16
Rounding

 Rounding is changing decimals into whole number
 This helps for easy adding and subtracting estimates
 Examples:

17
How do I know which way to round?

Easy Rule
 0.5 and above= Round up

 0.49 and below= Round down

18
Why bother rounding?

 Rounding helps make adding and subtracting easier.
 Example:

3.41+7.82=?
3.41 rounds down to 3
7.82 rounds up to 8

3+8=11 (much easier)
19
Rounding Practice

 Round the numbers in this equation and estimate the

2.76+7.11=?

20
Nope, try again

-Remember the Easy Rule: 0.5 and above= Round Up
0.49 and below = Round Down

Try Again

21
Exactly!

 2.76 rounds up to 3
 7.11 rounds down to 7
 7+3= about 10!

22
Adding and Subtracting Decimals

Decimals add together just like whole number.
Two things to remember:

1. Make sure the decimals line up
2. If no decimal is present in one
number, add a zero
Click to see
examples
23
Adding and Subtracting Examples

3.45+2.9=?         3.45+2.9=?

3.4 5              3.4 5
2.9 +            2.9 0 +
3 .74              6.35
24
Adding and Subtracting Examples

8 - 4.39=?        8 - 4.39= ?

4.39               8.00
8 -             4.39 -
4.31               3.61
25
Practice!

What is the sum of 4.38 + 2.8
(use paper and pencil if needed)

A. 7.28
B. 6
C. 4.66
D. 7.18

26
Nice try, bye-bye…

Try again. Click here if you would like to view the slides
again.

27
Correct!!

 Well done! You lined up the decimals and used a zero
when needed.

28
Subtraction practice!

 What is the difference of 9.78-5.1=?
A. 4.38
B. 9.27
C. 9.28
D. 4.68

29
Nope

 Remember to add zeros when needed.

Bah,
Humbug!

30
You’re doing great!

Well done, you have the hang out this

31
Metric System

 Decimals help us
understand the metric
system
 Large measurements can
be made smaller with
decimals
 This helps measure smaller
items (and people!)

32
Distance Measuring

 1/100 of a meter (or 0.01)         100 centimeters
 Good for measuring small           Good for measuring long
distances (like the length          distances (like the
of your computer screen)            distance between
countries!

33
Mass Measuring

 1000 grams
 Good for measuring large          1/1000 of a kilogram (or
masses (like an elephant)          0.001)
 Good for measuring small
masses (like this rat)

34
Volume Measuring

 1000 mililiters                  1/1000 of a liter (0.001
liters)
 Large liquid amounts
 Good for small liquids
 This bottle is a 2 liter
bottle                           Found in science a lot

35
Units

1000
0.01
0.001

These can be applied to ANY
measurement! (i.e. Kilograms,
Centiliters, kiloliters etc)

36
Quiz time!

 What would I most likely use to measure the mass of
a house?

A.   Grams
B.   Liters
C.   Kilograms
D.   Meters

37
Not quite…

 Not quite, remember “mili” means 0.001 (smaller)
“Kilo” means 1000 (larger)

38
Exactly!!!

 Good job, you’re really doing well!

39
Just two more questions!

What would you use liters to measure?

1)   The mass of your little brother
2)   The volume of a swimming pool
3)   The distance from your house to Central
4)   The volume of a juice box

40
Incorrect

(If you need to look closer at the slides, remember, you
can always click the “back” arrow before answering
questions.)

41
You’re right!

 Liters would work for a swimming pool!
 Liters would not work well for a juice box.
 Milliliters are smaller and would work a lot better

Continue!

42
Final Question!

You are planning on driving to New York this week.
How would you measure the distance to see how
much gas you will need? (remember the slide on
units)
A. Liters
B. Centimeters
C. Meters
D. Kilometers

43
Incorrect

 Good guess, it’s a tricky question. Remember that
units (Kilo, mili and centi) can apply to ANY type of
measuring.

44
Exactly!! Good job!

 A Kilometer is 1000 meters. This would work very
well in measuring a long distance!

Continue!

45
Almost…

 You could use meters to
measure the distance, but
it’s not the best answer.

 Remember, it might be
something not covered.

 Try again

46
The End

Well done! You obviously
know your stuff when it
comes to decimals and
measuring! Good luck on
the test, I know you’ll do
great!

Click the flag to end the
assignment
47
Content

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Content

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Content

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Question slide

53
Incorrect

54
Correct

Continue!

55
Question slide

56
Incorrect

57
Correct

Continue!

58
The End

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