Correction :

17 + 24 = 41	24 + 8 = 32
39 - 24 = 15	20 + 24 = 44
16 + 0 = 16	10 × 5 = 50
32 - 11 = 21	14 + 13 = 27
0 + 20 = 20	21 + 16 = 37
22 + 15 = 37	12 - 6 = 6
14 + 21 = 35	17 + 0 = 17
33 - 20 = 13	10 + 5 = 15
10 × 4 = 40	19 - 6 = 13
1 × 8 = 8	15 + 10 = 25