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42 × 771. 33742. 31943. 32844. 32345. None of these.

Answer» Correct Answer - Option 4 : 3234

Concept Used:-

Multiplication of two digit numbers using nearest base of 10.

Method and Calculation:-

 • Break the product in nearest base of 10

42 × 77 = (40 + 2) × (80 - 3)

 • Open the brackets by multiplying numbers inside bracket.

42 × 77 = 3200 + 160 - 120 - 6 = 3234



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