Answer
21
Work Step by Step
The Greatest Common Factor of two numbers is the largest number that we can multiply a whole number by to get both numbers. Thus, the Greatest Common Factor of 42, 63 and 105 is: 21.
Algebra 1
by Hall, Prentice
Published by
Prentice Hall
ISBN 10:
0133500403
ISBN 13:
978-0-13350-040-0
Skills Handbook - Factors and Multiples - Exercises - Page 787: 4
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