A number line can be useful when answering questions involving negative numbers. When adding a positive number, go up the number line (move to the right). When subtracting a positive number, go down ...

You can find the difference between two numbers in more than one way. You can count up from the smaller number to the larger number. Or, you can count back from the larger number to the smaller number ...

Use one of the services below to sign in to PBS: You've just tried to add this video to My List. But first, we need you to sign in to PBS using one of the services below. You've just tried to add this ...

This is a preview. Log in through your library . Abstract The number line is often recommended as an aid for the teaching of whole number addition and subtraction. The possible stages in young ...