63 : 7 = 9
56 : 8 = 7
48 : 8 = 6
9 × 7 = 63
6 × 6 = 36
7 × 7 = 49
8 × 3 - 3 × 8 = 24 - 24 = 0
7 × 6 - 6 × 7 = 42 - 42 = 0
4 × 8 - 8 × 3 = 32 - 24 = 8
54 - 24 : 6 + 40 = 54 - 4 + 40 = 90
90 - 21 + 42 : 7 = 90 - 21 + 6 = 75
35 - 30 : 5 + 25 = 35 - 6 + 25 = 54