Write the answers to the subtraction questions below (the first one is done for you).
13 - 2 = 11
16 - 2 = 14
15 - 4 = 11
19 - 7 = 12
14 - 2 = 12
19 - 5 = 14
15 - 1 = 14
19 - 3 = 16
19 - 2 = 17
18 - 4 = 14
18 - 7 = 11
13 - 1 = 12
16 - 6 = 10
12 - 2 = 10
18 - 3 = 15
14 - 3 = 11
16 - 5 = 11
17 - 3 = 14
16 - 1 = 15
16 - 3 = 13
19 - 1 = 18
17 - 2 = 15