In this activity, you have to work out different possibilities to make the given sum correct by filling in the gaps with suitable number pairs.
Example
Find ten different ways of making this sum correct.
370 + ___ + ___ = 500
Answer
We need to find pairs of numbers which add to 500 - 370 = 130
For example 60 + 70, which is shown in the first answer below. There are many other possibilities, some of which are shown below.
370 + 60 + 70 = 500
370 + 70 + 60 = 500
370 + 41 + 89 = 500
370 + 30 + 100 = 500
370 + 93 + 37 = 500
370 + 82 + 48 = 500
370 + 15 + 115 = 500
370 + 21 + 109 = 500
370 + 44 + 86 = 500
370 + 74 + 56 = 500
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Question
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Teacher explanation