This lesson is designed to reinforce skills associated with multiplying fractions and mixed
numbers and allow students to visualize the effects of multiplying by a fraction or mixed number.

Objectives

Upon completion of this lesson, students will:

have practiced multiplying fractions and/or mixed numbers.

have explored the effects of multiplying fractions and mixed numbers.

have practiced predicting the effects of multiplying a number by a fraction or mixed number.

Standards Addressed:

Grade 10

Estimation and Computation

The student accurately solves problems (including real-world situations).

Numeration

The student demonstrates conceptual understanding of real numbers.

Grade 6

Numeration

The student demonstrates conceptual understanding of fractions (proper or mixed numbers), decimals, percents (whole number), or integers.

The student demonstrates conceptual understanding of fractions, mixed numbers, or percents.

Grade 7

Numeration

The student demonstrates conceptual understanding of rational numbers (fractions, decimals, percents, or integers).

The student demonstrates conceptual understanding of positive fractions, decimals, or percents.

Grade 8

Numeration

The student demonstrates conceptual understanding of real numbers.

The student demonstrates conceptual understanding of rational numbers (fractions, decimals, or percents including integers).

Grade 9

Estimation and Computation

The student accurately solves problems (including real-world situations).

Numeration

The student demonstrates conceptual understanding of real numbers.

Fifth Grade

Number and Operations-Fractions

Apply and extend previous understandings of multiplication and division to multiply and divide fractions.

Seventh Grade

The Number System

Apply and extend previous understandings of operations with fractions to add, subtract, multiply, and divide rational numbers.

Sixth Grade

The Number System

Apply and extend previous understandings of multiplication and division to divide fractions by fractions.

Third Grade

Number and Operations-Fractions

Develop understanding of fractions as numbers.

Grades 6-8

Numbers and Operations

Compute fluently and make reasonable estimates

Understand meanings of operations and how they relate to one another

Grade 5

Number and Operations, Measurement, Geometry, Data Analysis and Probability, Algebra

COMPETENCY GOAL 1: The learner will understand and compute with non-negative rational numbers.

Grade 6

Number and Operations, Measurement, Geometry, Data Analysis and Probability, Algebra

COMPETENCY GOAL 1: The learner will understand and compute with rational numbers.

Grade 7

Number and Operations, Measurement, Geometry, Data Analysis and Probability, Algebra

COMPETENCY GOAL 1: The learner will understand and compute with rational numbers.

6th Grade

Numbers and Operations

The student will demonstrate through the mathematical processes an understanding of the concepts of whole-number percentages, integers, and ratio and rate; the addition and subtraction of fractions; accurate, efficient, and generalizable methods of multiplying and dividing fractions and decimals; and the use of exponential notation to represent whole numbers.

Reason for Alignment: The Multiplying Decimals lesson calls on the students use of number sense with decimals, which ties in with Target Game and Estimating Decimal Products in the textbook. This lesson should reinforce and extend the concepts of decimal multiplication. The Sequencer activity in the lesson is useful here, with students entering â€ś0â€? as the add-on. In this way, the multiplication can be repeated many times and patterns observed.

Reason for Alignment: The Multiplying Decimals and Fractions lesson contains a discussion about these skills. It strengthens the studentsâ€™ concepts as well as skills with the worksheets that accompany the lesson.

Student Prerequisites

Arithmetic: Student must be able to:

multiply whole numbers.

recall some knowledge regarding multiplication of mixed numbers and fractions.

ability to interpret a line graph (helpful, but not necessary).

Technological: Students must be able to:

perform basic mouse manipulations such as point, click and drag

use a browser for experimenting with the activities

Teacher Preparation

Students will need:

Access to a browser

Pencil and paper

Access to a calculator (optional)

Copies of supplemental materials for the activities:

Remind students what has been learned in previous lessons that will be pertinent to this lesson
and/or have them begin to think about the words and ideas of this lesson:

Can someone tell me the difference between a fraction and a mixed number?

Emphasize that the word "fraction", here, is used to refer to proper fractions only.

If I multiply the number 1 by a fraction, will the result be larger or smaller than 1? OR If I
multiply 1 by a mixed number, will the result be larger or smaller than 1?

Entertain a
discussion on fractions and mixed numbers including how to multiply these types of numbers.

Objectives

Let the students know what it is they will be doing and learning today. Say something like this:

Today, class, we will be talking about multiplying fractions and mixed numbers.

We are going to use the computers to look at the effect of multiplying a number by a fraction
or mixed number, but please do not turn your computers on or go to this page until I ask you
to. I want to show you a little about this program first.

Teacher Input

Explain to the students how to do the assignment. You should model or demonstrate it for the
students, especially if they are not familiar with how to use the computer applets on the Project
Interactivate site.

Open your browser to
The Sequencer in order to demonstrate this activity to the students.

Show the class that there is a box where they may enter a starting number, in other words, the
number that will be multiplied by a fraction or mixed number.

Show the class the box where they will enter the multiplier, or the number that our starting
number will be multiplied by.

Explain to the class that they should enter a "0" into the add-on box as this lesson is about
multiplying fractions, not adding them. Show students where to enter the zero.

Guided Practice

After answering all questions that the students might have regarding the use of The Sequencer,
pass out the
Multiplying Fractions Worksheet.

Walk the students through the worksheet, having all of the students in class use the same
numbers, for example: 3 for the whole number and 3/10 for the fraction. For each question, ask
two different students what they think the answer is. Ask the students to settle any disputes
on what the answers are.

Independent Practice

Allow students to work independently or in groups to complete the worksheet and circulate the
room to offer help where necessary.

When the students are finished with the Fraction worksheet, pass out the
Multiplying Mixed Numbers Worksheet and have them work through it independently.

Closure

Allow students to describe what steps are needed and how they differ when numbers are multiplied
by a fraction or a mixed number.

Alternate Outline

This lesson can be rearranged in several ways.

You may choose to allow students to work in cooperative groups to make predictions about the
effects of multiplying two particular numbers together and then check them as a class.

If only one computer is available, students can graph the "input" and "output" by hand to
discover the pattern. Students who need additional help can use The Sequencer to help them
visualize the pattern.