To get an internal sense of how numbers relate to each other, students can practice working with number lines.

There are lots of different tools that help you to do mental addition and subtraction. Remember, it doesn't have to be done entirely in your head, you can still use a pencil and paper to help.

Now there are 3 balloons left. Have a go at this subtraction quiz. Then work through the page and see if you can beat your score. Amir has 5 books. He gives 2 books to Fatima. How many books does ...