Correction :

4 × 8 = 32	3 : 3 = 1
2 + 11 = 13	32 - 9 = 23
9 + 0 = 9	14 - 4 = 10
20 + 20 = 40	29 - 19 = 10
24 + 6 = 30	0 + 4 = 4
4 × 8 = 32	28 - 19 = 9
21 - 1 = 20	27 - 24 = 3
21 + 16 = 37	13 - 1 = 12
4 + 4 = 8	13 + 8 = 21
8 - 8 = 0	1 + 12 = 13