Number lines can go up to any number, such as 10, 20, or even more! They help you to see where each number belongs and can be useful when adding and subtracting. This is a number line. This number ...

You can use a number line to help work out whether to round a number up or down. Let's look at rounding 44 to the nearest 10. First put 44 on the number line, then add the closest multiples of ten.