Education Technology

# Activities

• ##### Subject Area

• Math: Middle Grades Math: Number Sense
• Math: Middle Grades Math: Basic Facts
• Math: PreAlgebra: Number Sense and Operations

6-8

30 Minutes

• ##### Device
• TI-73 Explorer™

## Finding the GCF

#### Activity Overview

Students simplify fractions by dividing the numerator and denominator by the GCF (the greatest common factor). They check their work by using a calculator.

#### Before the Activity

• Set up the calculator as explained in the appendix file
• See the attached PDF file for detailed instructions for this activity
• Print the pages from the attached PDF file for the class
• #### During the Activity

Distribute the pages to the class.

• Without using the calculator, find the greatest common factor for the given fractions

• Enter the fraction and use the simplify function
• Note the new fraction displayed along with the factor used for simplification of the numerator and denominator
• Continue to simplify the fraction further till it can be no longer simplified
• Note all the factors used to simplify the fraction, and multiply the factors to get the GCF
• Verify the value of the GCF by entering the original fraction, using the simplify function key, and the GCF value to get the simplified fraction
• Find the GCF of the other fractions listed
• #### After the Activity

Review student results:

• As a class, discuss questions that appeared to be more challenging
• Re-teach concepts as necessary