Estimate the value of $31528 + 63, 82, 543 + 2, 16, 74, 52, 548$ to the nearest ten thousands and then compare it with the actual sum.

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Solution

Rounding off to the nearest thousands
$30, 000 + 63, 80, 000 + 2, 16, 74, 50, 000$
$= 2, 17, 38, 60, 000$
Actual sum
$31528 + 63, 82, 543 + 2, 16, 74, 52, 548$
$= 2, 17, 38, 66, 619$
Hence, the rounded sum is $6619$ less than the actual sum.

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