Answer
a) $3+3+3+3+3$
b) $3\cdot 5 = 3+3+3+3+3 = 5+5+5$
Work Step by Step
a) Repeated addition is multiplication. $3 \cdot 5$ means adding $3$ five times.
b)$3\cdot 5 = 5\cdot 3$ so $3\cdot 5$ can also be written as $5+5+5$
Prealgebra (7th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321955048
ISBN 13:
978-0-32195-504-3
Chapter 1 - Section 1.5 - Multiplying Whole Numbers and Area - Exercise Set - Page 51: 93
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