Use multiplication:
6 x 6:
Line up our numbers vertically:
6 | |
x | 6 |
Current result: 6 x 6 = 36
6 | |||
x | 6 | ||
3 | 6 |
Show value = 36
Add up our results by column:
6 | |||
x | 6 | ||
3 | 6 | ||
6 |
Adding up column 1, we get: 6
Our column sum becomes 6.
6 | |||
x | 6 | ||
3 | 6 | ||
3 | 6 |
Adding up column 2, we get: 3
Our column sum becomes 3.