Updated on 07/24/2015

#### 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.