Correction :

6 + 24 = 30	23 - 3 = 20
28 - 11 = 17	29 - 15 = 14
3 × 9 = 27	11 + 1 = 12
6 + 11 = 17	42 - 19 = 23
4 + 12 = 16	0 + 9 = 9
25 - 1 = 24	36 - 19 = 17
17 - 13 = 4	24 - 16 = 8
9 × 3 = 27	22 - 4 = 18
24 - 19 = 5	20 + 12 = 32
7 + 14 = 21	4 × 10 = 40