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7.5 + 9.2 = 16.7
So 16.7 is reasonable.

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You should not have to perform the addition in order to decide whether an estimate
was reasonable. That defeats the whole purpose of the estimating process.

Ignore the decimal parts of your two numbers, and you have (7 + 9). You don't need
a calculator to know immediately that THAT sum is 16. So 16 is a good estimate for
what you'll have when you glue the decimal bits back onto the whole numbers, and
when you reassemble everything and get a sum of 16.7 , that's so near your estimate
that you can be pretty sure that you added correctly.

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10y ago
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Q: Why is 16.7 a reasonable sum for 7.5 9.2?
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