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An Explorer lesson plan. Download a Claris Works or Acrobat file from the Explorer site. Also information on grades, availability, description, curriculum, process skills, author, and publisher.

Author:Joanne Caniglia

Grade Level:5-8

Description:Students practice subtraction using a square diagram.

Objectives:To subtract fractions with like and unlike denominators.

Resources/Materials:Circle grid

Activities/Procedures:

- On poster board students are to draw a figure similar to the one below.

- Laminating the drawing enables students to write on it many times with overhead or dry erase pens.

- The four outer squares should contain a fraction. Instruct students to subtract the smaller fraction from the larger one and place the answer in the circle that appears as the midpoint of the two fractions in the problem.

- Students are finished when they come to the center.

Evaluation:

Students can check their work as they work backwards - starting in the center and adding the midpoint circle and the smaller of the endpoint circles. This process reinforces addition of fraction.

Follow-up Activities (Optional):

Students can find four different fractions to place in the corners that will produce all ones or zeros. The success of this activity is based upon a property called the Density Property for Rational Numbers. Ask students if they believe that it is true that between any two rational numbers there is another rational number.

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