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 intervals. There are 10 in total. How many 10s go into 50?

When you divide 15 into groups of 5, you make 3 groups. A number line can help you to divide. You count on in steps of the number you want to divide by. Then, count how many steps there are and ...