Correction :

10 + 6 = 16	19 - 2 = 17
12 - 6 = 6	6 × 8 = 48
40 - 18 = 22	22 + 15 = 37
20 + 0 = 20	55 : 5 = 11
6 + 23 = 29	23 - 20 = 3
0 - 0 = 0	5 + 20 = 25
15 + 12 = 27	5 × 10 = 50
3 + 16 = 19	32 - 9 = 23
0 + 17 = 17	4 + 15 = 19
20 + 16 = 36	17 - 7 = 10