Question
If 74 × 35 = 3, 35 × 13 = 4, 54 × 42 = 3, then 78 ×
44 =?ÂSolution
(7 + 4) – (3 + 5) = 11 – 8 = 3 (3 + 5) – (1 + 3) = 8 – 4 = 4 (5 + 4) – (4 + 2) = 9 – 6 = 3 (7 + 8) – (4 + 4) = 15 – 8 = 7
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