Basic College Mathematics (9th Edition)

Published by Pearson
ISBN 10: 0321825535
ISBN 13: 978-0-32182-553-7

Chapter 4 - Decimals - 4.5 Dividing Decimal Numbers - 4.5 Exercises: 30

Answer

Estimate: 80. The answer given (78.3) is reasonable.

Work Step by Step

We need to check whether the answer given is reasonable: $395.415\div 5.05=78.3$ We estimate the answer by rounding: $395.415\div 5.05\approx 400\div 5=80$ We see that the given answer, $78.3$, and the estimate, $80$, are very close. Thus the given answer is reasonable. (We do not need to find the exact answer if the answer is reasonable.)
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