Correction :

23 + 16 = 39	27 - 12 = 15
1 × 5 = 5	17 + 14 = 31
10 + 1 = 11	45 - 23 = 22
44 : 11 = 4	38 - 23 = 15
12 - 9 = 3	38 - 18 = 20
14 - 1 = 13	25 - 8 = 17
19 + 18 = 37	9 × 1 = 9
35 - 23 = 12	36 - 22 = 14
3 × 7 = 21	60 : 10 = 6
17 - 11 = 6	6 × 2 = 12