# Activities

• ##### Download

• • ##### Subject Area

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

• ##### Author 6-8

60 Minutes

• ##### Device
• TI-73 Explorer™
• ##### Other Materials
This is Activity 4 from the EXPLORATIONS Book:
Discovering Mathematics with the TI-73: Activities for Grades 5 and 6

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Factors Galore C: Prime Factorization

#### Activity Overview

In this activity, students use the calculator to find the prime factorization of a number.

#### Before the Activity

• Set up the calculator as explained in the activity
• See the attached PDF file for detailed instructions for this activity
• Print pages 15 - 19 from the attached PDF file for your class
• #### During the Activity

Distribute the pages to the class.

Follow the Activity procedures:

• Enter a number as both the numerator and denominator of a fraction
• Use the calculator to find the new fraction simplified by the lowest prime factor
• Record the factor on the Activity sheet
• Repeat the process of simplifying the fraction by reducing the fraction by the lowest prime factor each time until the fraction is completely simplified
• Record all the prime factors on the Activity sheet
• Understand that the product of the common factors is the prime factorization of the number
• Express the prime factorization using powers
• Discuss an alternate way to find the prime factorization using the factor tree
• #### After the Activity

Students' complete the Student Activity sheet.

Review student results:

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