What is the greatest common factor of 36 and 40?

the greatest factor of 36 and 40 you just have to added then all toget 36 or - 4

We are trying to find the greatest common factor of the two. The greatest common factor (GCF) is when you try to find the biggest number that multiplies into both of them in any way that they share.

In order to do this, we should first list all of the factors of each number

These are the factors of 36:

1, 2, 3, 4, 6, 9, 12, 18, 36

We can use the rainbow rule to tell which of them multiply to each other

36*1=36, 18*2 = 36, 12*3=36, so on.

The greatest factor of 36 is itself since you can multiply by 1

Now, we should list the factors of 40:

1, 2, 4, 5, 8, 10, 20, 40

Now, we need to find the biggest number that matches up in between the two.

I will make the numbers that are in both bold.

1, 2, 3, 4, 6, 9, 12, 18, 36

1, 2, 4, 5, 8, 10, 20, 40

The number farthest to the right that I made bold is 4, so we have our answer.

Answer: The Greatest Common Factor of 36 and 40 is the number 4.