Correction :

2 × 10 = 20	34 - 11 = 23
63 : 9 = 7	16 + 23 = 39
4 + 6 = 10	11 + 24 = 35
1 × 7 = 7	30 - 21 = 9
90 : 10 = 9	14 + 15 = 29
16 + 5 = 21	0 + 21 = 21
27 - 10 = 17	3 + 13 = 16
36 - 16 = 20	8 + 10 = 18
19 + 24 = 43	27 - 24 = 3
7 × 11 = 77	28 - 17 = 11