Inverse Relationship Between Addition and Subtraction
- Make a set of triangular flash cards for each child to use for practice. Or, you might ask a parent or aid to help you. Then when you introduce a fact, you will have them available for all of your students.
- When working with children, watch for those children who may add all of the exercises even though the exercises they are working on have mixed signs.
- As you work with exercises that have mixed signs, have children point to the sign before they solve the fact and tell whether they should add or subtract.
- Remind children that if they have trouble remembering one fact, try to think of another fact in the family that they know.
- Once children have a good understanding of fact families, spend some time each day presenting exercises with missing addends.
- Spend time each day giving children problem solving situations where they have to choose the operation. Stress the fact that addition involves combining, while subtraction involves separating or comparing.
- When children practice their facts, suggest they work with the facts in families.