What is the Greatest common factor of 16 and 20?

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Answer 1 · 2018-03-05T23:50:14

See a solution process below:

Find the prime factors for each number as:

#16 = 2 xx 2 xx 2 xx 2#

#20 = 2 xx 2 xx 5#

Now identify the common factors and determine the GCF:

#16 = color(red)(2) xx color(red)(2) xx 2 xx 2#

#36 = color(red)(2) xx color(red)(2) xx 5#

Therefore:

#"GCF" = color(red)(2) xx color(red)(2) = 4#