Lesson Plan #:AELP-ATH0004 ** Author:** Elizabeth Lofties, St. Charles Borromeo Elementary School, Oklahoma City, Oklahoma ** Date:** 1994

**Grade Level(s):**3, 4, 5

** Subject(s):**

- Mathematics/Arithmetic

** OVERVIEW:**

Most students will benefit from the use of physical objects when they are introduced to the concept of equivalent fractions. This activity was designed to show the students that the notion of several names for a number is similar to the notion of several names for a person. One of them is the given name. In the same way that we refer to Rebecca Smith, alias Becky Smith, we can refer to 1/2, alias 3/6.

** OBJECTIVES:**

Students will be able to:

** RESOURCES/MATERIALS:**

Teacher: rectangular pieces of paper, chalkboard, chalk

Student: crayolas

** ACTIVITIES AND PROCEDURES:**

Introduce the vocabulary words numerator and denominator. The numerator is the number of parts shaded and the denominator is the total number of equal parts. (For those students who have difficulty remembering which is the numerator and which is the denominator, try this memory association technique—-In a fraction, one number is UP above the line and one is DOWN below the line. Numerator has an u in it and so does up; denominator begins with d and so does down.)

** TYING IT ALL TOGETHER:**

Once students have a firm understanding of equivalent fractions, they will be ready to find another name for a fraction by multiplying or dividing the numerator and denominator by the same (nonzero) number. This emphasis on equivalent fractions will pay dividends when you begin teaching addition and subtraction of fractions with unlike denominators.

May 1994 These lesson plans are the result of the work of the teachers who have attended the Columbia Education Center’s Summer Workshop. CEC is a consortium of teacher from 14 western states dedicated to improving the quality of education in the rural, western, United States, and particularly the quality of math and science Education. CEC uses Big Sky Telegraph as the hub of their telecommunications network that allows the participating teachers to stay in contact with their trainers and peers that they have met at the Workshops.