17. Without writing it down or using a calculator..
Subtract 7/32 from 3/4..
I was a carpenter for a good while and I can do it but the great majority of Americans can't, even if they fully understand fractions, which a lot of them don't.
Metric measurement calculations are much easier to do in your head than what we use in the USA.
How many inches in a mile?
How many centimeters in a kilometer?
The second question is far easier to answer, you just move the decimal point.
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