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Question

Estimate the following product by rounding off each number to nearest tens :

311×113


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Solution

Given, the product is 311×113.

For rounding off to the nearest tens, we first check the digit at one's place. If the digit at one's place is less than 5 then we replace it by zero but the digit at one's place is 5 then we add 1 to ten's place digit and replace one's place by zero.

We have,

311310113110311×113310×110=34100

Hence, the required round off is 311×11334100.


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