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Estimate:$5,700+8,999$
Rounding off to thousands:
Rounding off $5700$ to the nearest thousands$=6000$
Rounding off $8999$ to the nearest thousands$=9000$
On adding, we get,
$\boxed{6000+9000=15,000}$
Rounding off to hundreds:
Rounding off $5700$ to the nearest hundreds$=5700$
Rounding off $8999$ to the nearest hundreds$=9000$
On adding, we get,
$\boxed{5700+9000=14700}$
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