Prealgebra (7th Edition)

Published by Pearson
ISBN 10: 0321955048
ISBN 13: 978-0-32195-504-3

Chapter 4 - Section 4.4 - Adding and Subtracting Like Fractions, Least Common Denominator, and Equivalent Fractions - Exercise Set - Page 261: 21



Work Step by Step

$\frac{20}{21}$ -$\frac{10}{21}$ -$\frac{17}{21}$ Subtract the numerator. Keep the common denominator =$\frac{20-10-17}{21}$ = =$\frac{-7}{21}$ =-$\frac{7\times1}{7\times3}$ = -$\frac{1}{3}$
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