Number Bonds to 20 19 + 1 = 20 18 + 2 = 20 17 + 3 = 20 16 + 4 = 20 15 + 5 = 20 14 + 6 = 20 13 + 7 = 20 12 + 8 = 20 11 + 9 = 20 10 + 10 = 20 9 + 11 = 20.