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Question

Estimate 129×387


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Solution

Step 1: Rounding off 129 and 387 to the nearest hundred.

We know that to round off a number nearest to a hundred, we check the digit at the tens place.

If it is less than 5, we consider the unit and tens digit to be, 0.And if it is 5 or more than 5, we add 1 to the digit at hundred places, and the ones and tens place becomes 0.

So, in 129, the digit at tens place is 2i.e less than 5.

129 becomes 100 after rounding off.

Similarly, in 387, the digit at tens place is 8i.e more than 5.

387 becomes 400 after rounding off.

Step 2: Estimating 129×387

The estimated value of 129 is 100 and 387 is 400

So, the estimated value of 129×387=100×400

=40000

Hence, the estimated value of 129×387 is 40000


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