How can you use multiplication to check a division?

Answer 1

Always remember that multiplication is the inverse/opposite of division, so they can be used to check each other.

For example: Let's say the problem is 120 / 6. Whatever you think is your answer, you can multiple by 6 and that result should be 120.

Is 120 / 6 = 10? No. The quick check is 10 * 6 = 60, which does not equal 120.

Is 120 / 6 = 20? Yes! We know this is right because 20 * 6 = 120.