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Number Session 8, Part B: Fractions With Cuisenaire Rods
 
Session 8 Part A Part B Part C Homework
 
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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.


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Hint: Which rod can you fit five times along the length of the orange rod?
Hint: Use three identical rods that each represent one-fifth (15).
Hint: Which rod can you fit 10 times along the length of the orange rod?
Hint: 35 + 110 = 710
Move the rod that represents one-tenth (110) next to rods that each represent one-fifth (15).
Hint: 71025 = 310
Move the purple rod above your model for seven-tenths (710). Remove the red or white rods that take up the same space as one purple rod.
Hint: How many yellow rods can you fit along the length of the orange rod?
Hint: Choose a rod that can fit twice along the length of the rod that represents one whole.
Hint: There are many fractions you can model. Try to model 13, 34, and 59.

You can model a fraction by stacking two or more Cuisenaire® Rods.

If the orange rod represents the number one whole, which rod would you use to represent one-fifth (15)? If the orange rod represents the number one whole, how would you model three-fifths (35)? If the orange rod represents the number one whole, how would you model one-tenth (110)? Place your models for three-fifths (35) and one-tenth (110) on the grid. How would you represent the addition of these two fractions? Using one purple rod, place a model for two-fifths (25) on the grid. How would you represent the subtraction 71025? What fraction of the orange rod does the yellow rod represent? Use a red, purple, or brown rod to represent one whole. How can you represent one-half (12) of the rod you chose? What other fractions can you model using these Cuisenaire Rods?

Drag the Cuisenaire Rods onto the grid

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Cuisenaire® is a trademark of ETA hand2mind. All rights reserved.



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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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