Correction :

6 × 4 = 24	77 : 7 = 11
7 + 20 = 27	10 + 23 = 33
4 + 16 = 20	5 + 7 = 12
54 : 6 = 9	22 - 19 = 3
36 - 20 = 16	8 + 4 = 12
3 + 12 = 15	20 - 7 = 13
18 + 14 = 32	46 - 24 = 22
24 - 7 = 17	4 + 7 = 11
20 + 14 = 34	28 - 18 = 10
11 - 2 = 9	44 : 11 = 4