Answer
D
Work Step by Step
$11 \frac{19}{20}$ rounds up to 12, and $9\frac{1}{10}$ rounds down to 9, so by rounding to estimate their sum you get 21.
Prealgebra (7th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321955048
ISBN 13:
978-0-32195-504-3
Chapter 4 - Section 4.7 - Operations on Mixed Numbers - Exercise Set - Page 303: 116
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