10 5 + 5 = 16 11 9 10 21 9 - 7 = 5 16 2 8 3 3 - 2 = 8 1 9 4 3 8 + 1 = 9 10 7 8 1 12 - 7 = 6 7 5 9 3 3 + 2 = 4 5 8 10 3 11 - 10 = 6 2 8 1 3 5 - 4 = 1 9 2 6 3 9 + 7 = 15 2 16 18 14 6 - 6 = 1 8 12 0 2