Estimate the sum of (538+276) by rounding off each of the numbers to their nearest tens.

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800

810

820

none of these

answer is C.

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Detailed Solution

Given the sum (538+276).
We know that if the number placed at the ones digit is less than 5, the number will become 0, and if the number is higher than or equal to 5, the number will become 10.
Thus, rounding off 538 to the nearest tens.
The number placed at one's digit is equal to 8 which is greater than 5.
So, the number 538 after rounding off will be 540.
Similarly, rounding off 276 to the nearest tens, the number placed at one's digit is equal to 6 which is greater than 5.
So, the number 276 after rounding off will be 280.
Hence, our two numbers are 540 and 280, their sum will be,
540 + 280 = 820
Therefore, the correct option is 3.

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