Show how to use a square diagram to add/subtract the fractions:

1. 3/4 + 2/3

2. 5/6 - 3/4

3. 2/3 + 3/8

Watch a refresher on how to do this here.

Show how to use a square diagram to multiply the fractions:

4. 2/3 x 2/5

5. 1/4 x 2/3

6. 2/3 x 5/6

Watch a refresher on how to do this here.

Also discussed in class were fraction models and representations.

I have lots more cool fraction stuff online, including links to applets and SMART Notebooks, in my Elementary Ed Math for Grad Students course.  Check out Unit 3 of any year.