Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 4 - Number Representation and Calculation - Chapter Summary, Review, and Test - Review Exercises - Page 245: 32

Answer

The result of subtraction of indicated base is \[\text{230}{{\text{4}}_{\text{five}}}\].

Work Step by Step

Now, start by subtracting the numbers in right-hand column \[{{1}_{\text{five}}}-{{2}_{\text{five}}}\]. \[{{2}_{\text{five}}}\]is greater than \[{{1}_{\text{five}}}\]so, need borrow from the preceding column. Now, borrow one group of 5, because in provided question working in base five. This gives a sum of \[1+5\] or 6 in base ten. Now, subtract 2 from 6, \[\begin{align} & \text{ 1} \\ & \begin{matrix} \text{ 412}{{\text{1}}_{\text{five}}} \\ -\text{ 131}{{\text{2}}_{\text{five}}} \\ \text{ 4} \\ \end{matrix} \\ \end{align}\] Now, subtracting the numbers in second right-hand column \[{{1}_{\text{five}}}-{{1}_{\text{five}}}\] \[\begin{align} & \text{ 1} \\ & \begin{matrix} \text{ 412}{{\text{1}}_{\text{five}}} \\ -\text{ 131}{{\text{2}}_{\text{five}}} \\ \text{ 04} \\ \end{matrix} \\ \end{align}\] Now, perform the subtraction in the third column from the right \[{{1}_{\text{five}}}-{{3}_{\text{five}}}\]. \[{{3}_{\text{five}}}\]is greater than \[{{1}_{\text{five}}}\]so, need borrow from the preceding column. Now, take borrow one group of 5 because in provided question working in base five. This gives a sum of \[1+5\] or 6 in base ten. Now, subtract 3 from 6, \[\begin{align} & \text{ 3 1} \\ & \begin{matrix} \text{ 412}{{\text{1}}_{\text{five}}} \\ -\text{ 131}{{\text{2}}_{\text{five}}} \\ \text{ 304} \\ \end{matrix} \\ \end{align}\] Now, perform the subtraction in the third column from the right. \[\begin{align} & \text{ 3 1} \\ & \begin{matrix} \text{ 412}{{\text{1}}_{\text{five}}} \\ -\text{ 131}{{\text{2}}_{\text{five}}} \\ \text{ 230}{{\text{4}}_{\text{five}}} \\ \end{matrix} \\ \end{align}\] Hence, the result of subtraction of indicated base is \[\text{230}{{\text{4}}_{\text{five}}}\].
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