Correction :

4 × 8 = 32	5 : 1 = 5
20 + 22 = 42	9 × 9 = 81
20 + 13 = 33	34 - 18 = 16
24 - 8 = 16	3 + 4 = 7
3 × 9 = 27	25 - 16 = 9
34 - 16 = 18	20 - 16 = 4
10 + 10 = 20	13 + 24 = 37
40 - 18 = 22	17 + 15 = 32
31 - 14 = 17	19 + 18 = 37
2 + 0 = 2	35 - 23 = 12