## Prealgebra (7th Edition)

a) $3+3+3+3+3$ b) $3\cdot 5 = 3+3+3+3+3 = 5+5+5$
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 $5+5+5$