Launching a Fractions Task
Common Core State Standards
Math 
Math 
4 
Grade 4 
NF 
Number & OperationsFractions 
B 
Build fractions from unit fractions 
3a 
Understand a fraction a/b with a > 1 as a sum of fractions 1/b. a. Understand addition and subtraction of fractions as joining and separating parts referring to the same whole. b. Decompose a fraction into a sum of fractions with the same denominator in more than one way, recording each decomposition by an equation. Justify decompositions, e.g., by using a visual fraction model. Examples: 3/8 = 1/8 + 1/8 + 1/8 ; 3/8 = 1/8 + 2/8 ; 2 1/8 = 1 + 1 + 1/8 = 8/8 + 8/8 + 1/8. c. Add and subtract mixed numbers with like denominators, e.g., by replacing each mixed number with an equivalent fraction, and/or by using properties of operations and the relationship between addition and subtraction. d. Solve word problems involving addition and subtraction of fractions referring to the same whole and having like denominators, e.g., by using visual fraction models and equations to represent the problem. Grade 4 expectations in this domain are limited to fractions with denominators 2, 3, 4, 5, 6, 8, 10, 12, 100. 
Download Common Core State Standards (PDF 1.2 MB) 
Common Core State Standards
Math 
Math 
4 
Grade 4 
NF 
Number & OperationsFractions 
B 
Build fractions from unit fractions 
3c 
Understand a fraction a/b with a > 1 as a sum of fractions 1/b. a. Understand addition and subtraction of fractions as joining and separating parts referring to the same whole. b. Decompose a fraction into a sum of fractions with the same denominator in more than one way, recording each decomposition by an equation. Justify decompositions, e.g., by using a visual fraction model. Examples: 3/8 = 1/8 + 1/8 + 1/8 ; 3/8 = 1/8 + 2/8 ; 2 1/8 = 1 + 1 + 1/8 = 8/8 + 8/8 + 1/8. c. Add and subtract mixed numbers with like denominators, e.g., by replacing each mixed number with an equivalent fraction, and/or by using properties of operations and the relationship between addition and subtraction. d. Solve word problems involving addition and subtraction of fractions referring to the same whole and having like denominators, e.g., by using visual fraction models and equations to represent the problem. Grade 4 expectations in this domain are limited to fractions with denominators 2, 3, 4, 5, 6, 8, 10, 12, 100. 
Download Common Core State Standards (PDF 1.2 MB) 

Lesson Idea  Common CoreUnderstanding Fractions through RealWorld TasksGrade 3 / Math / ModelingMath.3.NF.A.1 / Math.3.NF.A.2a / Math.Practice.MP4
 53
 9

Teaching PracticeStep Back: Promoting Independent ThinkingAll Grades / Math / Reasoning
 305
 6

Teaching PracticeCreating a Community of LearnersAll Grades / Math / Collaboration
 411
 10
In Partnership with
and
Lesson Objective
Use fractions to solve a realworld problem about chocolate bars
Length
7 min
Questions to Consider
 What do students do before getting the task?
 How does Ms. Linares make sure students understand the problem?
 What do you notice about how Ms. Linares balances time for both individual and group work?
Common Core Standards
Math.4.NF.B.3a, Math.4.NF.B.3c
Watch all the videos in this series.
Teacher & School Info

Patty Linares
 School Details
 Orange Grove Elementary School Somerton, AZ
 Population
 376 students
 District Spending
 $7,015
Supporting Materials

Launching a Fractions Task Transcript

Worksheet: Snickers Bars Task.PDF