#### Answer

$8$

#### Work Step by Step

To estimate $\sqrt {61}$, we use the square root function on our calculator to find that $\sqrt {61} \approx 7.81$.
Since $7.81$ is closer to $8$ than to $7$, we estimate the square root to be $8$.

Published by
Prentice Hall

ISBN 10:
0133500403

ISBN 13:
978-0-13350-040-0

$8$

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