Factors & GCF

Factors & GCF

A factor is a number that can

divide into a number evenly.

EX. 60-1,60,2,30,3,20,5,12,

That may not be all of them, but do you

understand how 3 goes into 60 20

times. Also 5 goes into 60 12 times.

Greatest Common Factor

The GCF of something is the

Greatest Common Factor of 2 numbers.

EX.

30-1,30,2,15,3,10,5,6

42-1,42,2,21,3,14,6,7

the greatest common factor would be 6,

because 6 is the greatest number that goes

into 30 and 42 evenly.

EX.

75-1,75,3,25,5,15

90-1,90,2,45,3,30,18,5,15,6,10,9

in this case the greatest common

factor would be 15, because 15 is the

greatest common factor

that goes into 75 and 90 evenly.

http://www.math.com/school/subject1/lessons/S1U3L2GL.html