This activity is about subtraction in columns with borrowing if necessary.

Example

Subtract 

816 - 846

Answer

We set the subtraction out in columns.

Starting from the right-hand ones end, we start subtracting, remembering to borrow from the next column if we need to.

The answer is 330.

Are you happy with that?

Let's have a go at this in some questions now. You can look back at this introduction again if you need to by clicking on the red help button that will appear on the screen during the questions.

Let's get started!