Each addition or subtraction fact will match one of 3 options. Can you use your fingers, a number-line or a 100 square to work out the answer, then match a peg to the correct answer? green - to 10 (fingers) blue - to 20 (number line) red - to 100 ((100 square) - adding/subtracting 1 digit numbers yellow - to 100 (100 square) - adding subtracting 2 digit numbers