1.

Find the value of: 71 × 211. 14912. 15213. 14714. 15815. None of these

Answer» Correct Answer - Option 1 : 1491

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 = 2 × 7 = 14

B = 2 + 7 = 9

AB1 = 1491

Hence, 1491 is our answer.


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