Addition & subtraction strategies to solve two-digit equations using an open number line. In this lesson, students go over using addition and subtraction strategies to solve two-digit equations using ...

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 ...