Answer
$21$.
Work Step by Step
The given numbers are
$42,63$
Prime factorization of each number is
$42=2\cdot 3 \cdot 7$
$63=3\cdot 3 \cdot 7 $
Common prime factors are
$=3 \cdot 7 $
Simplify.
$=21$
Hence, the greatest common factor is $21$.
Big Ideas Math - Algebra 1, A Common Core Curriculum
by Larson, Ron; Boswell, Laurie
Published by
Big Ideas Learning LLC
ISBN 10:
978-1-60840-838-2
ISBN 13:
978-1-60840-838-2
Chapter 7 - Polynomial Equations and Factoring - Maintaining Mathematical Proficiency - Page 355: 8
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