Answer
$0.4=\frac{2}{5}$
Work Step by Step
Multiply $\frac{10}{10}$, which is equal to 1, by the decimal to find:
$0.4(\frac{10}{10})
\\= \frac{4}{10}
\\=\frac{2}{5}$
Notice that we reduced the fraction.
Thinking Mathematically (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0321867327
ISBN 13:
978-0-32186-732-2
Chapter 5 - Number Theory and the Real Number System - 5.3 The Rational Numbers - Exercise Set 5.3 - Page 284: 39
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