Meanings of Fractions

Lesson 9-1

9-1 Vocabulary Words

Purpose

You have learned about You have learned about fractions in previous grades. fractions in previous grades. Today you will learn how to Today you will learn how to compare part of an amount to compare part of an amount to the whole amount.the whole amount.

Connect

Where in your life is it Where in your life is it necessary to divide a whole necessary to divide a whole something into equal parts?something into equal parts?

Birthday cake, sharing a piece of paper or candy, pizza

Problem

Lisa needs to divide a large Lisa needs to divide a large rectangular pizza into 4 same-size rectangular pizza into 4 same-size pieces. How many ways can you pieces. How many ways can you find for how she might do this? find for how she might do this?

Remember- the pieces do not have Remember- the pieces do not have to be the same shape, just the to be the same shape, just the same size!!!same size!!!

Pizza anyone?

Academic Vocabulary

AA fractionfraction describes one or describes one or more more parts of a parts of a whole whole that is that is divided into divided into equalequal parts. parts.

Denominator

The 4 is the denominator. The 4 is the denominator. The denominator The denominator describes the total describes the total number of equal parts or number of equal parts or the total number of the total number of objects.objects.

Numerator

The 2 is the numerator. The 2 is the numerator. The numerator describes The numerator describes the number of equal parts the number of equal parts or objects that are being or objects that are being described. described.

Mario’s Bread

This circle This circle represents Mario’s represents Mario’s

bread and the bread and the shaded parts shaded parts

represent the parts represent the parts he he gives awaygives away..

How many parts does How many parts does the circle have?the circle have?

How many parts are How many parts are shaded?shaded?

4

2 out of 4

You can write “2 out of 4” as a fraction.

You read the fraction from top to bottom… two out of 4. When you see the line, it stands for “out of” or “divided by.”

How much of the bread did Mario give away?

How do you know?

2/4 of the bread

The fraction describes the 4 equal pieces and the 2 pieces given away

Find the fraction that shows the shaded parts of each of these fractions.

Extend

Work with your group and model Work with your group and model five sixths using classroom five sixths using classroom objects. You have 5 minutes, objects. You have 5 minutes, then you will share your work.then you will share your work.

CreditsFraction Clip Art:

http://www.teacherspayteachers.com/Store/Nicholas-Reitz

http://sweetrhyme-purereason.blogspot.com/

Screen shots from slides 2 and 6 from EnVision Math Online.