#### Answer

Because $1~mi^2= 640~acres$, the unit fraction needed to convert from acres to square miles is $\frac{1~mi^2}{640~acres}$ and the unit fraction needed to convert from square miles to acres is $\frac{640~acres}{1~mi^2}$

Published by
Pearson

ISBN 10:
0321867327

ISBN 13:
978-0-32186-732-2

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