#### Transcript of Common Denominators and Reducing Fractions

**And Reducing Fractions**

**Common Denominators**

What is a denominator?

A denominator is the bottom number of a fraction, it shows how many equal parts something is divided into.

What is a Common Denominator?

A common denominator just means that the

denominators in two or more fractions are the same.

Reducing Fractions: Also known as the Lowest Common Denominator

Before we start to add and subtract fractions,

we must learn how to reduce fractions to its

lowest common denominator. This will help us

simplify the end result.

These are important to add and subtract fractions,

which we will do in the next class.

To find the lowest common denominator, we

need to divide by their greatest common factor

Greatest Common Factors

For example, here is a sample fraction

We must find the Greatest Common Factor (GCF) of the

numerator and the denominator

We divide the numerator by the GCF and....

Let's Do Another

Here's our fraction

We must find the GCF

=

=

12

16

12

16

1, 2, 3, 4, 6, 12

1, 2, 4, 8, 16

Divide the numerator and denominator by the GCF

12

16

÷4

÷4

=

3

4

Let's Do Some Practice Questions

Complete the worksheet that I will hand out. I will be

marking the work for tomorrow. Show ALL of your work. This is important to me so that I can assess your work and see where your strengths and next steps will be.

Use the rest of class time to work on your homework.

Greatest Common Factor

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