Correction :

16 + 9 = 25	8 + 2 = 10
23 + 20 = 43	13 + 8 = 21
32 - 20 = 12	7 - 0 = 7
18 + 6 = 24	28 - 14 = 14
12 - 2 = 10	13 + 20 = 33
34 - 13 = 21	11 + 8 = 19
2 × 4 = 8	14 + 1 = 15
24 - 20 = 4	5 × 9 = 45
10 : 2 = 5	23 + 14 = 37
27 - 24 = 3	3 + 8 = 11