In this activity, we will find the missing number in a given calculation.

Example

Work out the missing number:

1000 - _____ = 219

Answer

We can use the fact that 1000 - 219 will give us our missing number.

1000 - 219 = 781

1000 -   781   = 219

We will need to think about doing the inverse of calculations to solve many of these questions.

Let's get started!