54 + 20
60 + 18
97 + 3
6 + 71
46 + 30
20 + 14
78 + 2
64 + 3
54 + 20 = (50 + 4) + 20 = (50 + 20) + 4 = 70 + 4 = 74
60 + 18 = 60 + (10 + 8) = (60 + 10) + 8 = 70 + 8 = 78
97 + 3 = (90 + 7) + 3 = 90 + (7 + 3) = 90 + 10 = 100
6 + 71 = 6 + (70 + 1) = 70 + (6 + 1) = 70 + 7 = 77
46 + 30 = (40 + 6) + 30 = (40 + 30) + 6 = 70 + 6 = 76
20 + 14 = 20 + (10 + 4) = (20 + 10) + 4 = 30 + 4 = 34
78 + 2 = (70 + 8) + 2 = 70 + (8 + 2) = 70 + 10 = 80
64 + 3 = (60 + 4) + 3 = 60 + (4 + 3) = 60 + 7 = 67
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