# Activities

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• • ##### Subject Area

• Math: Elementary Math: Fractions

• ##### Author K-5

30 Minutes

• ##### Device
• TI-Nspire™ Apps for iPad®
• TI-Nspire™ CX/CX II
• TI-Nspire™ CX CAS/CX II CAS
• ##### Software

TI-Nspire™
TI-Nspire™ CAS

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Multiplying Fractions by a Whole Number

#### Activity Overview

This activity uses a number line to develop multiplication of a fraction by a whole number. It builds on the earlier concept that the product of two whole numbers r and s is r sets, each containing s elements.

#### About the Lesson

This TI-Nspire™ lesson uses a number line to develop multiplication of a fraction by a whole number. It builds on the earlier concept that the product of two whole numbers r and s is r sets, each containing s elements. Using the same reasoning in the context of a number line, the product of c and the fraction would be c copies of , which is equivalent to ca copies of . Students learn how to mark a “unit” such as on a number line (e.g., a product is sold in units of of a pound) and visualize the value of 5 copies of (e.g., the amount you would have with five units).

Students should be familiar with the following vocabulary: unit fraction, factors, improper fraction, and mixed number covered in earlier activities.

This is Lesson 9 out of 15 in the Building Concepts in Mathematics: Fractions Series.

Standards