Marilyn

Directions Write new words and terms in the box. Write a definition, show an example, or draw a picture for each word or term in your list.147Lesson11continuedComparing unit fractions and fractionswith common numeratorswhole groupwhole groupStep4Introduce more mathvocabulary.Step5Introduce comparingfractions with commonnumerators.1 Review denominator and explainunit fraction.h The numerators for 2 ​1_ ​and 8 ​1_ ​are the same, butthe denominators are different. As you know, thedenominator is the number below the fraction barin a fraction. What are the two denominators onthe chart?(2 and 8)Write denominator on the chart and draw aline from it to the 2 in ​ 1_ 2 ​. Have students readdenominator aloud with you.Next, write ​ 1_ 2 ​, 3 ​1_ ​, 4 ​1_ ​, 5 ​1_ ​, and 8 ​1_ ​on the chart, sayingeach fraction aloud as you write it.h When a fraction has 1 as the numerator, it iscalled a unit fraction. The whole can be dividedinto any number of equal parts. The fraction forone of those parts is a unit fraction. All of thefractions on the chart are unit fractions.Write unit fraction next to the examples as shown.Have students read unit fraction aloud with you.Math Vocabulary• common numerator• numerator​_1 2 ​ ​1 _8 ​• denominator• unit fraction ​ 1 _2 ​ ​1 _3 ​ ​1 _4 ​ ​1 _5 ​ ​1 _8 ​1 Present two fractions with the samenumerator.On the board replace ​ 1_ 2 ​and ​1_ 8 ​with ​3_ 12 ​and ​3_ 4 ​. Displaythe magnetic fraction strips. Point out that to showa fraction like ​ 3_ 12 ​, you make a train with three ​1_ 12 ​pieces. Have students read each fraction aloud.3__12 ​ ​3 _4 ​hLet’s say aloud which fraction is greater.( ​3_Let’s say aloud which fraction is less. ( ​ 3_4 )12 )2 Explain why ​ 3_ 4 ​is greater than ​3_ 12 ​.h In the fraction ​ 3_ 12 ​, what does the 12 mean?(The whole is cut into 12 equal pieces.) What doesthe 3 mean? (There are 3 pieces.) In the fraction​ 3_ 4 ​, what does the 4 mean? (The whole is cut into4 equal pieces.) What does the 3 mean? (There are3 pieces.) Explain why ​ 3_ 12 ​ is less than ​ 3_ 4 ​.Have students think, pair, share. (Twelfths aresmaller than fourths and there are 3 pieces of each,so ​ 3_ 12​is less than ​3_ 4 ​. )Language Development2 Students write the vocabulary andread the definitions.Have students copy what is on thechart onto WorkSpace page 147.Then have them read thedefinitions in the glossarybeginning on page 153.Math VocabularyresourcesStudents typically refer to fractions as “bigger” or“larger” rather than “greater.” This makes sensewhen comparing the physical fraction kit pieces.However, when comparing numerical fractions, aswith all numbers, use “greater than” consistently tohelp students become familiar with that terminology.Similarly, use “less than” instead of “smaller than.”110Reason With Fractions