Over the course of this year, Gracie's been working on learning addition and subtraction facts. Addition, seemed to be pretty straightforward for her, but subtraction proved to be a bit trickier. Several strategies have helped her understand the addition/subtraction connection.
1. Subtraction as reverse addition
Show how the digits of an addition fact such as 1 + 2 = 3 (1 2 3)can be written in reverse order (3 2 1). Put in a subtraction sign and an equal sign to get a subtraction fact (3 -2 = 1).
2. Writing equations
Give your child the three digits of an addition problem. Have your child write 2 addition and 2 subtraction problems using only those 3 digits.
3. Three-cornered flashcards
These flashcards can be used for addition or subtraction practice. Each card has the three numbers of a fact family. Cover one corner up with your finger and figure out the missing number. (Multiplication and division are shown, but addition and subtraction are also available.)