Answer
7
Work Step by Step
The GCF, or Greatest Common Factor, of two numbers is the greatest number that can be multiplied by a whole number to get both numbers. Thus, the Greatest Common Factor of 7 and 21 is 7.
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281140
ISBN 13:
978-0-13328-114-9
Skills Handbook - Factors and Multiples - Exercises - Page 799: 2
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