Good afternoon,

I have just finished a lesson in Fractions that involves finding the GCF(Greatest Common Factor) of two numbers. It is important that the student has mastered his/her multiplication facts.If the student is struggling then they can use a multiplication chart. Using the chart repeatedly, will usually reinforce learning. I have provided an example:

FYI...

Product= the answer when two factors are multiplied together

Factors= two numbers multiplied together

When finding factors it is not necessary to repeat numbers such as;

in the factors of 4

they are: 1x4,4x1, and 2x2

It is only necessary to write each number once. {1,2,4}

Now let's try this!

Find the GCF of 4 and 10:

first write down all factors of 4; like 1x4, 4x1, and 2x2

the factors are {1,2,4}

next write down all factors of 10; like 1x10, 10x1,2x5, and 5x2

the factors are {,1,2,5,10}

Identify common factors of both 4 and 10; they are {,1,2}

Identify the largest or greatest factor; {2}

GCF= 2

## Comments