Correction :

16 + 0 = 16	4 - 2 = 2
26 - 22 = 4	19 - 18 = 1
5 + 23 = 28	4 - 0 = 4
20 + 17 = 37	9 + 7 = 16
33 - 22 = 11	6 × 2 = 12
3 × 4 = 12	38 - 21 = 17
14 + 9 = 23	14 + 14 = 28
12 - 5 = 7	24 + 5 = 29
15 + 20 = 35	2 + 3 = 5
24 - 13 = 11	7 + 10 = 17