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Multiplying large numbers by splitting

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Multiplying large numbers by splitting Created by: Sabrina Edmondson Adapted from BBC online Multiplying large numbers by splitting Have a look at the following ... – PowerPoint PPT presentation

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Title: Multiplying large numbers by splitting


1
Multiplying large numbers by splitting
  • Created by Sabrina Edmondson
  • Adapted from BBC online

2
Multiplying large numbers by splitting
  • Have a look at the following equation
  • 255 x 5

3
Multiplying large numbers by splitting
  • First split the number into hundreds, tens and
    ones.
  • 255 splits into 200, 50 and 5

4
Multiplying large numbers by splitting
  • Then, multiply each of the numbers by 5.5 x
    200 1 0005 x 50 2505 x 5 25

5
Multiplying large numbers by splitting
  • This method can be represented in a grid, as
    shown below.

6
Multiplying large numbers by splitting
  • Finally, add the three numbers together to get
    your answer.

7
Multiplying large numbers by splitting
  • So 255 x 5 1,275
  • Remember check the answer by doing the
    opposite! 1,275 5 255

8
Multiplying large numbers by splitting
  • Now have a look at this equation
  • 255 x 25

9
Multiplying large numbers by splitting
  • First split the number into hundreds, tens and
    ones.
  • 255 splits into 200, 50 and 5 (these go along
    the top)
  • 25 splits into 20 and 5 (these go along the
    sides)

10
Multiplying large numbers by splitting
  • Then, multiply each number in the column by each
    number in the row.
  • Have a look at the grid below.

11
Multiplying large numbers by splitting
  • Add up each column, then add the resulting
    numbers together.

12
Multiplying large numbers by splitting
  • So 255 x 25 6,375
  • Remember check the answer by doing the
    opposite! 6,375 25 255
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