Learn Fractions with Cuisenaire Rods
The standard method of showing fractions with the Cuisenaire Rods is to place one rod over the other to compare their size. The rods can be shown vertically or horizontally (as shown below).
Arrange your rods to represent 1/2 and 3/4 using the purple rod as the denominator. In order to represent 1/2 using the purple rod as the denominator we must first express the fraction in equivalent terms. Since 2 red rods in a train equals 4 cm. we must multiply the numerator and denominator by 2 red rods.
Take the numerator 1 * 2 red rods = 2
Take the denominator 2 * 2 red rods = 4
So representing 1/2 using the purple rod as the denominator equals 2/4 as shown below.
Now, in order to represent 3/4 using the purple rod as the denominator. Since 1 purple rod equals 4 cm. we must multiply the numerator and denominator times 1 purple rod.
Take the numerator 3 * 1 purple rod = 3
Take the denominator 4 * 1 purple rod = 4
So representing 3/4 using the purple rod as the denominator equals 3/4 as shown below.
Now it's your turn:
A. Arrange your rods to represent each of the following fractions using the dark green rod as the denominator.
For Example: 1/6 =
1. 1/2 = 2. 2/3 =
3. 5/6 = 4. 2/6 =
B. Arrange your rods to represent each of the following fractions using the brown rod as the denominator.
For Example: 4/8 =
5. 3/4 = 6. 3/8 =
7. 2/8 = 8. 5/8 =
C. Now for a real challenge! Let's say the orange and red rod are taped together as the unit. We'll call this color rorange. Represent each of the following fractions using the rorange rod as the denominator.
For Example: 7/12 =
9. 1/2 = 10. 1/3 =
11. 1/4 = 12. 5/6 =
Check your Answers.
|What are Cuisenaire Rods?||Using Cuisenaire Rods to Name a Fraction||Identify the Numerator and Denominator||Least Common Denominator||Adding and Subtracting Fractions|
|Equivalent Fractions||Teacher Notes||Cuisenaire Kids Page||GirlTECH Lessons||More Math Lessons|
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This page was developed through GirlTECH '97, a teacher training and student technology council program sponsored by the Center for Research on Parallel Computation (CRPC), a National Science Foundation-funded Science and Technology Center.
© June 1997 Molly Silha