# Lesson 9

You Ate the Whole Thing

### Lesson Purpose

The purpose of this lesson is for students to recognize 2 halves, 3 thirds, and 4 fourths as one whole.

### Lesson Narrative

In previous lessons, students partitioned circles and rectangles into halves, thirds, and fourths and identified an equal piece of different shapes as a half of, third, of, or fourth of the shape.

In this lesson, students continue to practice partitioning circles and describe halves, thirds, and quarters of circles using the language a half of, a third of, and a quarter of to describe a piece of the shape. They also use this language to describe the whole shape as a number of equal pieces. Students recognize that a whole shape can be described as 2 halves, 3 thirds, or 4 fourths. This understanding is the foundation for students' work with a whole and fraction equivalency in grade 3.

The activities encourage students to use quarters and a quarter of when describing fourths of a circle. This word choice is used to help students connect to the language used when telling time to the half and quarter hour in upcoming lessons.

• Representation

### Learning Goals

Teacher Facing

• Describe two halves, three thirds, and four fourths as one whole.
• Use “half of,” “a third of,” and “a quarter of” to describe parts of a shape.

### Student Facing

• Let’s talk about the whole.

### Required Materials

Materials to Gather

Building Towards

### Lesson Timeline

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

### Teacher Reflection Questions

In an upcoming lesson, students will learn to tell time to the half hour and quarter hour. What do you notice in their work from today’s lesson that you might leverage in that lesson?

### Suggested Centers

• How Are They the Same? (1–5), Stage 2: Grade 2 Shapes (Addressing)