What is a number line? A number line is a straight line with numbers written in order from lowest to highest. Number lines can go up to any number, such as 10, 20, or even more! They help you to ...

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 ...