Correction :

33 - 23 = 10	27 - 10 = 17
9 - 4 = 5	15 + 14 = 29
7 + 18 = 25	11 × 8 = 88
6 + 6 = 12	23 - 6 = 17
72 : 9 = 8	8 + 22 = 30
0 - 0 = 0	23 - 3 = 20
18 + 1 = 19	13 + 21 = 34
9 - 6 = 3	10 + 21 = 31
24 + 14 = 38	27 - 8 = 19
12 + 16 = 28	11 + 13 = 24