Correction :

16 - 12 = 4	7 + 16 = 23
22 + 6 = 28	32 - 15 = 17
2 × 8 = 16	3 + 5 = 8
4 + 17 = 21	25 - 14 = 11
6 × 1 = 6	21 - 2 = 19
21 - 21 = 0	23 + 21 = 44
9 - 8 = 1	13 + 24 = 37
29 - 18 = 11	28 - 11 = 17
6 + 5 = 11	0 + 20 = 20
25 : 5 = 5	8 + 11 = 19