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 31 × 71
1. 2431
2. 2271
3. 2201
4. 2241
5. None of these.

1 Answer

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Best answer
Correct Answer - Option 3 : 2201

Concept used:-

Trick to multiply two digit numbers ending in 1.

Method:-

  • Multiply the left most digits of both the numbers.
  • Add the left most digits of both the numbers.
  • Put the result from Step(2) next to the result of Step(1)
  • Put 1 next to the result of Step(3)

Calculation:-

Let the product be AB1

A = 3 × 7 = 21

B = 3 + 7 = 10

AB1 = 21|10|1

Carryover of B (10) is shifted and added to 21.

Hence, 2201 is our answer.

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