Correction :

0 + 23 = 23	37 - 18 = 19
23 + 10 = 33	16 : 2 = 8
3 + 17 = 20	36 - 13 = 23
72 : 9 = 8	27 - 24 = 3
2 × 2 = 4	9 + 17 = 26
9 × 6 = 54	6 + 18 = 24
20 - 4 = 16	22 + 23 = 45
3 - 1 = 2	20 + 11 = 31
28 - 17 = 11	12 - 1 = 11
16 + 3 = 19	23 + 4 = 27