Multiplying using the Lattice Method by 8tDh90y

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									        Keys Skills


Multiplication using lattice
          method

   TUTOR VERSION
         Outcomes from this
              session

    At the end of this session you should be
                     able to
Understand how to multiply decimals using the
lattice method


Complete practical examples to verify learning
        (Step 1) Multiply 301 x 1.2

              3         0       1

                                         1


                                         2




Fill the numbers around the outside of the box
        (Step 2 ) Multiply 301 x 1.2

                 3           0       1
             0           0       0
                                             1
                     3       0           1

             0           0       0
                                             2
                     6       0       2




Multiply the outside numbers and enter in the
                    boxes
  (Step 3 ) Multiply 301 x 1.2

          3           0       1
      0           0       0
                                      1
              3       0           1

      0           0       0
                                      2
              6       0       2
 3
      6           1       2


We then add the diagonal numbers
            (Step 4 ) Multiply 301 x 1.2

                     3           0       1
                0            0       0
                                                 1
                         3       0           1

                 0           0       0
                                                 2
                         6       0           2
           3
                 6           1       2

3612 Now add the decimal point one place

Answer = 361.2
                Multiply 4.5 x 631

                    6           3       1
               2            1       0
                                                4
          2             4       2           4

                3           1       0
                                                5
                        0       5           5
          8
                3           9       5

28395 Now add the decimal point one place

Answer = 2839.5
                Multiply 18.4 x 2.1

                     1           8           4
                0            1           0
                                                     2
                         2           6           8

                 0           0           0
                                                     1
                         1           8           4
           3
                 8           6           4

3864 Now add the decimal point two places

Answer = 38.64
               Multiply 960 x 0.42

                    9           6           0
               3            2           0
          4
                                                    4
                        6           4           0

                1           1           0
                                                    2
                        8           2           0
          0
                3           2           0

40320 Now add the decimal point two places

Answer = 403.20
                 Multiply 134 x 1.2

                     1           3           4
                0            0           0
                                                     1
                         1           3           4

                 0           0           0
                                                     2
                         2           6           8
           1
                 6           0           8

1608 Now add the decimal point one place

Answer = 160.8
                Multiply 13.4 x 1.2

                     1           3           4
                0            0           0
                                                     1
                         1           3           4

                 0           0           0
                                                     2
                         2           6           8
           1
                 6           0           8

1608 Now add the decimal point two places

Answer = 16.08
                Multiply 1.34 x 1.2

                     1           3           4
                0            0           0
                                                     1
                         1           3           4

                 0           0           0
                                                     2
                         2           6           8
           1
                 6           0           8

1608 Now add the decimal point three places

Answer = 1.608
Jon bought 27 lengths of decking each 1.75m long
What was their total length
                    1       7          5
                   0       1       1           2
                       2       4           0
                   0       4       3
                                               7
              4        7       9           5

                  7        2       5


  4725 Now add the decimal point one place

  Answer = 47.25 m
Talia worked for 23 hours at a rate of £6.35 an hour.
How much was the total earnings?
                  6       3     5
                   1       0       1           2
             1         2               0
                               6
                   1       0       1
                                               3
              4        8       9       5

                  6        0       5


  14605 Now add the decimal point two places

  Answer = £146.05
Gwen sells kites for £4.75 each. She sells 26 kites.
How much does she get for the 26 kites?
                 4        7     5
                   0       1       1           2
             1         8               0
                               4
                   2       4       3
                                               6
              2        4       2       0

                  3        5       0


  12350 Now add the decimal point two places

  Answer = £123.50
A shop sells plants for 95p. Find the cost of 35 plants?


                               9           5
                           2           1           3
                                   7           5

                           4           2
                                                   5
              3                    5           5

                  3        2           5


  3325 Now add the decimal point two places

  Answer = £33.25 pence
               Further exercises
1a. 257 x 57          14,649

b. 309 x 8.3           2,564.7


c. 573 x 0.48          275.04


d. 812 x 603            489,636


e. 912 x 56.3          51,345.6
             Further exercises
2. A caterer charges £16 per head. How much is the
   charge for 45 people?

                           £720



3. There are 48 tins in each tray. How many are there in 35
trays?


                        1,680 tins
              Further exercises
4. A school has 36 classes. Each class has 31 children.
   How many children are there at the school?


                      1,116 children



5. A concert hall has 85 rows of 48 seats. What is the total
   number of seats?


                       4,080 seats

								
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