What is the Gcf of 81 and 27?

1 Answer
Jim G.
Dec 14, 2016

#27#

Explanation:

This method uses only #color(blue)"subtraction"# to find the GCF.

#•" subtract smaller number from larger number"#

#•" Repeat this until a common value is obtained"#

#•" The common value is the GCF"#

#" The starting numbers are 81 and 27"#

#rArr81-27=54rarr" numbers are now 54 and 27"#

#rArr54-27=27rarr" numbers are now 27 and 27"#

#" common value of 27 reached"#

#" Hence GCF = 27"#

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