Lesson 1

One Piece of One Part

Lesson Purpose

The purpose of this lesson is for students to interpret and represent a unit fraction of a unit fraction with diagrams.

Lesson Narrative

In the previous unit, students found the product of a whole number and a fraction or mixed number, using tape diagrams and area diagrams. This unit continues that work to include products of two fractions. The goal of this lesson is for students to investigate fractions of fractional quantities in context. The focus is on interpreting representations in terms of the context (MP2). In later lessons, students will see that the diagrams can be represented by multiplication or division expressions.

In the first activity, students draw and explain their own representation of a situation involving macaroni and cheese. Students’ representations may differ so the discussion focuses on how their diagrams represent the situation. The second activity focuses on area diagrams like students worked with at the end of the previous unit. This lesson prepares students to relate diagrams to expressions in the next lesson.

• Action and Expression
• MLR2

Learning Goals

Teacher Facing

• Represent and interpret a unit fraction of a unit fraction in ways that make sense to them.

Student Facing

• Let’s solve problems about unit fractions.

Building Towards

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

Which students had opportunities to share their diagrams and thinking during whole-class discussion? How did you select these students?

Suggested Centers

• Rolling for Fractions (3–5), Stage 2: Multiply a Fraction by a Whole Number (Supporting)
• Five in a Row: Multiplication (3–5), Stage 4: Three Factors (Supporting)