Answer
21
Work Step by Step
The GCF, or Greatest Common Factor, of multiple numbers is the greatest number that can be multiplied by a whole number to get all of the numbers. Thus, the Greatest Common Factor of 42, 63, and 105 is 21.
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: 4
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