Numbers can be placed in order on a number line like this:

When there are numbers missing, say them in your head as you move along the line.

Example

Match the missing numbers on this number line to the letters.

Answer

Here we say 

15... 16... 17... 18... 19... 20... 21... 22... 23... 24... 25

So

A is 20

B is 16

C is 23

Make sure that you write the correct number for each letter because they may be out of order, as they are in the example above.

Are you ready to have a go at the questions?