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Number Session 8, Part B: Fractions With Cuisenaire Rods
 
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Session 8, Part B:
Fractions With Cuisenaire Rods

In This Part: Representing Fractions With Rods | Other Denominators
Modeling Operations | Try It Yourself

Use the following Interactive Activity to work on the problems below, which let you use the rods to try out representations and operations with fractions.

This activity requires the Flash plug-in, which you can download for free from Macromedia's Web site. For a non-interactive version, use Cuisenaire Rods or print several copies of the Rods Template (PDF) on stiff paper and then cut them out.


Problem B1

Solution  

a. 

What rod would you use as a unit to do computations with fifths?

b. 

What rod would you use as a unit to do addition and subtraction with fifths and halves?

c. 

How are the combinations of rods you can use related to factors?


 

Problem B2

Solution  

a. 

Model 1/2 + 2/5.

b. 

Model 3/5 - 1/2.

c. 

Model 3/5 • 1/2.

d. 

Model 4/5 1/2.


 

Problem B3

Solution  

What rod (or combination of rods) would you use as a unit to perform the following computations with thirds and fourths?

a. 

1/3 + 1/4

b. 

3/4 - 1/3

c. 

3/4 • 1/3

d. 

2/3 3/4


Stop!  Do the above problem before you proceed.  Use the tip text to help you solve the problem if you get stuck.
The rod that you are using to represent "1" will need to be more than a single rod. In this case, it is best to choose the orange rod plus whatever rod you need to make the appropriate length.   Close Tip

 
 

Use the Interactive Activity to explore operations with other fractions.



video thumbnail
 

Video Segment
In this video segment, Rhonda and Andrea use rods to model multiplication and division with thirds and fourths. First they must figure out what their model is going to be in order to do their computations. Watch this segment after you've completed Problems B2 and B3.

If you are using a VCR, you can find this segment on the session video approximately 11 minutes and 42 seconds after the Annenberg Media logo.

 

Next > Part C: Absolute and Relative Reasoning

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