There are a number of methods for multiplying two numbers together.
One that is very popular (even if it's a bit slower than other methods) is the grid method.
e.g. Calculate 36 x 25.
Step 1: Split the numbers up. -> 36 = 30 + 6 and 25 = 20 + 5
Step 2: Create a grid and put the numbers around the outside.
30 | 6 | |
20 | ||
5 |
Step 3: For each of the spaces in the grid, multiply the number on the top by the number on the left side.
30 | 6 | |
20 | 600 | 120 |
5 | 150 | 30 |
Step 4: Add all these numbers together.
600 |
+ 120 |
+ 150 |
+ 30 |
900 |
Before you start this activity, make sure you have a pen and paper handy so that you can create your own grids as we go.
Let's get started!