Correction :

10 - 1 = 9	29 - 24 = 5
5 × 5 = 25	17 - 9 = 8
11 + 9 = 20	10 + 0 = 10
13 - 9 = 4	1 + 18 = 19
10 - 9 = 1	21 - 7 = 14
7 + 18 = 25	0 + 7 = 7
23 + 12 = 35	15 + 0 = 15
13 - 6 = 7	66 : 11 = 6
19 + 19 = 38	10 × 2 = 20
10 + 24 = 34	15 + 1 = 16