In this activity, we will be finding the missing number to make the total of 1,000.

Example

Find the number that makes the calculation correct.

380 + __ =  1,000

Answer

The opposite (inverse) of adding is subtracting.

So we work out 1,000 - 380

We can do this in stages 1,000 - 300 = 700

700 - 80 = 620

Does that make sense?

Let's practise this in the following questions.