You can use addition to help you solve subtraction problems. Subtraction is the opposite of addition. 

When you add two numbers together the answer is a bigger number than either of the ones you started with.   

Fact families use the same three numbers and put them in different order. Addition and subtraction fact families have 2 addition problems and 2 subtraction problems.

You can use a hundred chart to add and subtract. 
Remember, subtraction is the opposite of addition so the directions for addition and subtraction on a hundred chart are opposite of each other.

When you go down one square you add 10. When you go up one square you subtract 10. When you move to the right you add 1 for each square you count. When you move to the left you subtract 1 for each square you count.