Correction :

44 - 24 = 20	39 - 16 = 23
15 - 6 = 9	15 + 8 = 23
10 × 10 = 100	42 - 23 = 19
20 - 11 = 9	21 + 11 = 32
29 - 16 = 13	13 - 0 = 13
14 - 5 = 9	9 + 15 = 24
19 - 8 = 11	5 + 22 = 27
12 - 8 = 4	5 + 19 = 24
23 - 23 = 0	2 × 10 = 20
22 - 4 = 18	17 - 17 = 0