Inverse operations are really important in maths, for example when you have to solve equations (which is a huge topic), you can't do it without these inverse operations.
Inverse operations require us to do the opposite.
The opposite of + is -
The opposite of - is +
The opposite of x is ÷
The opposite of ÷ is x
What is the opposite of +7?
What is the opposite of dividing by 2?
And: Multiplying by 2
I add 7 and then multiply by 2. If my answer is 18, what was my original number?
This one is a bit more challenging. We have two operations, + 7 and x 2. The inverse operations for these would be - 7 and ÷ 2
But which one do we use first?
If we are doing the opposites, we are going backwards. In the question, we added 7 first then multiplied by 2. When we are doing the inverse, we swap this order as well.
Do to solve this we divide by 2 first, then subtract 7.
18 ÷ 2 = 9
9 - 7 = 2
Now it's your turn to have a go!