Correction :

26 - 16 = 10	15 + 21 = 36
18 + 15 = 33	20 + 5 = 25
3 × 7 = 21	27 - 20 = 7
23 - 15 = 8	13 + 17 = 30
6 + 15 = 21	33 - 15 = 18
13 - 0 = 13	3 + 13 = 16
20 + 7 = 27	3 + 12 = 15
1 × 5 = 5	8 × 7 = 56
26 - 10 = 16	56 : 8 = 7
21 - 11 = 10	32 - 19 = 13