Question
If 49 × 23 = 41, 26 × 47 = 23 and 64 × 99 = 42, then
57× 68 = ?Solution
49 × 23 → (4 × 9) + 2 + 3 = 36 + 5 = 41 26 × 47 → (2 × 6) + 4 + 7 = 12 + 11 = 23 64 × 99 → (6 × 4) + 9 + 9 = 24 + 18 = 42 57 × 68 → (5 × 7) + 6 + 8 = 35 + 14 = 49
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