There is a pattern to how the numbers are written from 1 to 100, but we can’t hear a regular pattern in the way we say the numbers until we get to the number 20. For example, count aloud from 31 ...

you can see how far 100 and 1000 are away from each other. Take a look at the examples below to see how you can use number lines to estimate, work out and write numbers. Next, count the number of ...