What is the GCF of 18 and 30?

1 Answer
Jim G.
Mar 8, 2018

6

Explanation:

"this method uses only "color(blue)"subtraction"" to find GCF"

• " Subtract smaller number from larger number"

• " Repeat this until a "color(red)"common value ""is obtained"

• "The "color(red)"common value ""is the GCF"

•color(white)(x)30" and "18larrcolor(blue)"starting numbers"

30-18=12larr"larger subtract smaller"

•color(white)(x)18" and "12larrcolor(blue)"numbers after subtraction"

18-12=6larr"larger subtract smaller"

•color(white)(x)12" and "6larrcolor(blue)"numbers after subtraction"

12-6=6larr"larger subtract smaller"

•color(white)(x)6" and "6larrcolor(red)"common value"

rArr"GCF "=6

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