4 + 3 = 7 7 + 3 = 10 6 + 3 = 9 5 + 3 = 8 10 + 3 = 13   12 − 2 = 10 8 − 2 = 6 9 − 2 = 7 7 − 2 = 5 10 − 2 = 8