# Lesson 3

Stories with Fractions

### Lesson Purpose

The purpose of this lesson is to use understanding of equivalence to solve addition and subtraction problems with decimal fractions. Students also create their own word problems that involve the addition and subtraction of fractions.

### Lesson Narrative

In a previous lesson, students solved word problems that involved adding and subtracting fractions and using equivalent fractions. Here, students continue to apply their understanding of fractions to solve problems that require adding or subtracting decimal fractions. Students also show their understanding of the structure of fractions and word problems to create their own situations given a value or equation and some constraints. In doing so, they practice reasoning quantitatively and abstractly (MP2).

Invite students to use the Three Reads routine as needed to solve problems. If students need additional support with the concepts in this lesson, refer back to Unit 3, Section B in the curriculum materials.

• Representation
• MLR8

### Learning Goals

Teacher Facing

• Solve and create word problems involving addition and subtraction of fractions referring to the same whole.

### Student Facing

• Let’s add and subtract mixed numbers.

### Lesson Timeline

 Warm-up 10 min Activity 1 20 min Activity 2 15 min Lesson Synthesis 10 min Cool-down 5 min

### Teacher Reflection Questions

Think about a time in today’s lesson when you asked questions to address a misconception or to clarify a student’s understanding. What questions were effective in surfacing a misunderstanding or the student’s thinking about the math? What questions would you ask differently and why?