Estimate: $(21397 + 27807 + 42505)$

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Solution

Estimate the given sum:
$21397 \to 21000$ [rounding off to nearest thousands]
$27807 \to 28000$ [rounding off to nearest thousands]
$42505 \to 43000$ [rounding off to nearest thousands]
Closure estimate $= (21397 + 27807 + 42505) = 21000 + 28000 + 43000 = 92000$
Hence, the estimated sum is $92, 000$ .

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