# My trial lesson

Finding the Greatest Common Factor (Denominator)
We have the Fraction 24/30
We are going to try to find the Greatest Common Factor for the number 24 and 30 so we can reduce them.
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Slide 1: Slide
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This lesson contains 20 slides, with interactive quizzes and text slides.

## Items in this lesson

Finding the Greatest Common Factor (Denominator)
We have the Fraction 24/30
We are going to try to find the Greatest Common Factor for the number 24 and 30 so we can reduce them.

#### Slide 1 -Slide

Finding the Greatest Common Factor (Denominator)
First we have to determine if 24 (the smaller number) is an even or odd number.

#### Slide 2 -Slide

Is 24 odd or even
A
odd
B
even

#### Slide 3 -Quiz

24 is an even number.
Even numbers can be divided by 2.

#### Slide 4 -Slide

What is 24 divided by 2

#### Slide 5 -Open question

Next we look at the result 12 and ask if that is also an even number?

#### Slide 6 -Slide

Next we look at the result 12 and ask if that is also an even number?
A
Yes
B
No

What is 12/2

What is 6/2

#### Slide 11 -Slide

Is 3 a prime number?
A
Yes
B
No

#### Slide 12 -Quiz

3 is a prime number which means we have completed factoring 24.
Now we have the prime numbers to use for getting our Greatest Common Factor. And we move them over to 32.

#### Slide 13 -Slide

Is 32 an even number? Can it be divided by 2?
A
Yes
B
No

#### Slide 15 -Slide

What is 32 divided by 2

8
16
4
1
Can't do it.

#### Slide 18 -Slide

Last step is to multiply the numbers that both of them share. Multiply 2x2x2 which equals 8.
The greatest common factor of 24 and 32 is 8.

#### Slide 19 -Slide

So the original fraction 24/32 can be reduced to
24/8