# Launching a Fractions Task

Grade 4 / Math / Modeling
CCSS: Math.4.NF.B.3a Math.4.NF.B.3c

Common Core State Standards

 Math Math 4 Grade 4 NF Number & Operations--Fractions 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 & Operations--Fractions 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)

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### Lesson Objective

Use fractions to solve a real-world problem about chocolate bars

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.

Common Core Standards
Math.4.NF.B.3a, Math.4.NF.B.3c