Correction :

11 + 14 = 25	21 - 6 = 15
11 × 9 = 99	7 + 1 = 8
29 - 23 = 6	11 × 1 = 11
24 - 23 = 1	13 - 6 = 7
4 + 24 = 28	1 + 5 = 6
21 - 20 = 1	4 × 7 = 28
3 + 3 = 6	2 + 21 = 23
37 - 14 = 23	47 - 23 = 24
17 - 1 = 16	23 + 1 = 24
40 : 8 = 5	30 - 22 = 8