Correction :

16 + 16 = 32	20 - 0 = 20
19 + 23 = 42	23 - 10 = 13
39 - 21 = 18	17 - 4 = 13
19 + 23 = 42	4 × 4 = 16
4 + 14 = 18	4 + 17 = 21
0 + 16 = 16	15 + 5 = 20
2 + 7 = 9	9 : 1 = 9
33 - 23 = 10	8 × 8 = 64
19 + 10 = 29	17 + 17 = 34
20 - 20 = 0	43 - 19 = 24