1. Fractions – Parts of a Set Dr. Beth McCulloch Vinson Athens State University PT3 Grant Funding, Summer 2000

2. Fractions  A fraction can show us a part of a set.  In this example, we have 1 red jewel and 2 blue jewels. 2 blue jewels 1 red jewel

3. Fractions  Our total number in the set is 1, 2, 3 jewels in all. Count them with me. 1 2 3 We’ll put our total number on the bottom of our fraction because the big, heavy number sinks to the bottom. ___ 3 total # of jewels

4. Fractions  The total number of red jewels is 1. We’ll put that number on top of the 3. 1 # of red jewels 3 total # of jewels 1 red jewel

5. Fractions  We read it like this: “I have 3 jewels in all. One-third of my jewels are red.” 1 # of red jewels 3 total # of jewels

6. Fractions  We can also say: “I have 3 jewels in all. One-third of my jewels are red.” 1 3 2 blue jewels 1 red jewel “Two-thirds of my jewels are blue.” 2 3

7. Now you do one by yourself. How many jewels are there in this set? You’re right! There are 4 jewels in all.

8. Now you do one by yourself. What part of this set has blue jewels? You’re right! There are 3 blue jewels.

9. Now you do one by yourself. How do we write that as a fraction? You’re right! “Three-fourths of our jewels are blue.” 3 4

10. THE END A Project Developed for Preparing Tomorrow’s Teachers to Use Technology (PT3) By Dr. Beth McCulloch Vinson Athens State University, College of Education http://www.athens.edu/vinsobm