1/28
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3 × 6
18
3 × 7
21
3 × 8
24
6 × 7
42
6 × 8
48
7 × 8
56
6²
36
7²
49
8²
64
Rule: × 9 (example 9 × 7)
10 × 7 − 7 = 70 − 7 = 63
Rule: × 5 (example 5 × 8)
Half of 10 × 8 = half of 80 = 40
Rule: × 11 up to 9 (example 11 × 6)
Repeat the digit: 66
Rule: × 4 (example 4 × 7)
Double twice: 7 → 14 → 28