Inverse

Inverse means the opposite in effect. The reverse of.

The Inverse of Adding is Subtracting

Adding moves you one way, subtracting moves you the opposite way.

Example: 20 + 9 = 29 can be reversed by 29 - 9 = 20 (back to where we started)

And the other way around:

Example: 15 - 3 = 12 can be reversed by 12 + 3 = 15 (back to where we started)

The Inverse of Multiplying is Dividing

Multiplying can be "undone" by dividing.

Example: 5 × 9 = 45 can be reversed by 45/9 = 5

It works the other way around too, dividing can be undone my multiplying.

Example: 10 / 2 = 5 can be reversed by 5 × 2 = 10

But Not With 0

You can't divide by 0, so don't try!

Example: 5 × 0 = 0 cannot be reversed by 0/0 = ???