Title: Multiplying large numbers by splitting
1Multiplying large numbers by splitting
- Created by Sabrina Edmondson
- Adapted from BBC online
2Multiplying large numbers by splitting
- Have a look at the following equation
- 255 x 5
3Multiplying large numbers by splitting
- First split the number into hundreds, tens and
ones. - 255 splits into 200, 50 and 5
-
4Multiplying large numbers by splitting
- Then, multiply each of the numbers by 5.5 x
200 1 0005 x 50 2505 x 5 25
5Multiplying large numbers by splitting
- This method can be represented in a grid, as
shown below.
6Multiplying large numbers by splitting
- Finally, add the three numbers together to get
your answer.
7Multiplying large numbers by splitting
- So 255 x 5 1,275
- Remember check the answer by doing the
opposite! 1,275 5 255
8Multiplying large numbers by splitting
-
- Now have a look at this equation
- 255 x 25
-
9Multiplying 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)
10Multiplying large numbers by splitting
- Then, multiply each number in the column by each
number in the row. - Have a look at the grid below.
11Multiplying large numbers by splitting
- Add up each column, then add the resulting
numbers together.
12Multiplying large numbers by splitting
- So 255 x 25 6,375
-
- Remember check the answer by doing the
opposite! 6,375 25 255