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# Common Denominators and Reducing Fractions

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## Miranda Beare

on 26 January 2017

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#### 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
Full transcript