How to use the "grid method" to multiply a 3 digit number by a 1 digit number.

1. Multiplying a 3 digit number by a
1 digit number
Using the Grid Method
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2. First, split the 3 digit number into
hundreds, tens and units.
For example;
642 is split up as 600, 4O and 2

3. First, split the 3 digit number into
hundreds, tens and units.
For example;
642 is split up as 600, 4O and 2
289 is split up as 200, 80 and 9

4. First, split the 3 digit number into
hundreds, tens and units.
For example;
642 is split up as 600, 4O and 2
289 is split up as 200, 80 and 9
356 is split up as 300, 50 and 6

5. Then put the hundreds, tens and units into the top part of the
grid and the number that you are multiplying by down the side
of the grid.
For example: 642 x 7:
x
7
600
40
2

6. Then put the hundreds, tens and units into the top part of the
grid and the number that you are multiplying by down the side
of the grid.
For example: 642 x 7:
x
600
40
2
7
Then multiply the hundreds (600) by the number on the side (7):
x
600
7
4200
40
2

7. Then put the hundreds, tens and units into the top part of the
grid and the number that you are multiplying by down the side
of the grid.
For example: 642 x 7:
x
600
40
2
7
Then multiply the hundreds (600) by the number on the side (7):
x
600
7
40
2
4200
Then multiply the tens (40) by the number on the side (7):
x
600
40
7
4200
280
2

8. And then multiply the units (2) by the number on the side (7):
x
600
40
2
7
4200
280
14

9. And then multiply the units (2) by the number on the side (7):
x
600
40
2
7
4200
280
14
Finally, add the 3 answers (4200, 280 and 14) together:
642 x 7 = 4200 + 280 + 14
= 4494

10. That’s it for now......
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