Question
If 49 × 45 = 45, 45 × 69 = 35 and 67 × 78 = 57, then
39 × 43 = ?Solution
49 × 45 → (4 × 9) + 4 + 5 = 36 + 9 = 45 45 × 69 → (4 × 5) + 6 + 9 = 20 + 15 = 35 67 × 78 → (6 × 7) + 7 + 8 = 42 + 15 = 57 39 × 43 → (3 × 9) + 4 + 3 = 27 + 7 = 34
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