In this activity, we will be finding the missing number in a calculation.
Find the number that makes the calculation correct.
332 + __ = 900
The opposite (inverse) of adding is subtracting.
So we work out 900 - 332 = 568
Here is a simpler example:
400 + ___ = 600
The inverse operation is:
600 - 400 = 200
The answer is 200
Does that make sense?
Let's practise this skill in the following questions.