In this activity, we will work out different possibilities to make the given calculation correct by filling in the gaps with suitable number pairs.

 

Example

Find 10 different ways of making this sum correct.

 

370 + ___ + ___ = 500

 

Answer

First of all, we need to do 500 - 370 to find out what the two missing numbers will add up to.

 

500 - 370 = 130

 

We need to find pairs of numbers which add to 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

 

Let's have a go at some questions.