Math Facts 9+ Addition Facts for 1-18 Tools A B 0 + 9 9 1 + 9 10 2 + 9 11 3 + 9 12 4 + 9 13 5 + 9 14 6 + 9 15 7 + 9 16 8 + 9 17 9 + 9 18 10 + 9 19 11 + 9 20 12 + 9 21 13 + 9 22 14 + 9 23 15 + 9 24 16 + 9 25 17 + 9 26 18 + 9 27