Thinking Mathematically (6th Edition)

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 285: 119

Answer

\[-\frac{5}{6}=-0.8\overline{3}\,\,\text{and}\,\,-\frac{8}{9}=-0.\overline{8}\] This shows that \[-\frac{5}{6}>-\frac{8}{9}\].

Work Step by Step

The rational number \[-\frac{5}{6}\] can be written in decimal form as follows: \[-6\overset{-0.8333}{\overline{\left){\begin{align} & 5.000 \\ & \underline{4\,\,8} \\ & \,\,\,\,20 \\ & \underline{\,\,\,\,18} \\ & \,\,\,\,\,\,20 \\ & \,\,\,\,\,\,\,\,\,\,. \\ & \,\,\,\,\,\,\,\,\,\,. \\ \end{align}}\right.}}\] The rational number \[-\frac{8}{9}\] can be written in decimal form as follows: \[-9\overset{-0.888}{\overline{\left){\begin{align} & 8.000 \\ & \underline{7\,\,2} \\ & \,\,\,\,\,80 \\ & \,\,\,\,\,\,\,\,. \\ & \,\,\,\,\,\,\,\,. \\ \end{align}}\right.}}\] Thus, the rational numbers in decimal form can be written as \[-\frac{5}{6}=-0.8\overline{3}\,\,\text{and}\,\,-\frac{8}{9}=-0.\overline{8}\] This shows that \[-\frac{5}{6}>-\frac{8}{9}\].
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