Elementary Technical Mathematics

Published by Brooks Cole
ISBN 10: 1285199197
ISBN 13: 978-1-28519-919-1

Chapter 16 - Section 16.3 - Subtraction of Binary Numbers - Exercise - Page 554: 23

Answer

Answer is $-10$.

Work Step by Step

$$\text{Solution}$$ Here $A = 01, B = 11.$ Find $A - B = ?$ using 1's complement $\rightarrow$ First, find 1's complement of $B = 11$ $\rightarrow $ Write out the numbers as if you were subtracting decimals. $$-\begin{array}{c|c} 01 \\ 11 \\ \hline \end{array}$$ $\rightarrow $ Let's use the 1's Complement Method $\rightarrow $ 1's complement of a number is obtained by subtracting all bits from $11$ $\rightarrow $ $\text{1's complement of 11 is}$ $$-\begin{array}{c|c} 11 \\ 11 \\ \hline 00 \end{array}$$ $\rightarrow $ Now Add this 1's complement of B to A Note $\rightarrow$ Addition Rules $0 + 0 = 0$ $0 + 1 = 1$ $1 + 0 = 1$ $1 + 1 = 10$ ("$0$" in the column, carry $1$ to the next bit) So, $$+\begin{array}{c|c} 01 \\ 00 \\ \hline 01 \end{array}$$ $\rightarrow$ Here there is no carry, the answer is - (1's complement of the sum obtained $01$) 1's complement of $01$ is $$+\begin{array}{c|c} 11 \\ 01 \\ \hline 10 \end{array}$$ so the Answer is $-10$.
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