# Comparing Value for Money: Baseball Jerseys

## Mathematical goals

This lesson unit is intended to help you assess how well students are able to:

• Interpret a situation and represent the variables mathematically. Select appropriate mathematical methods to use. Explore the effects of systematically varying the constraints.
• Interpret and evaluate the data generated and identify the break-even point, checking it for confirmation. Communicate their reasoning clearly.

## Introduction

• Before the lesson students attempt the task individually. After reviewing responses, you formulate questions for students to consider when planning improvements to their work.
• At the start of the lesson, students think individually about the questions posed.
• Next, students work in small groups to combine their thinking and work together to produce a collaborative solution to the Baseball Jerseys task, in the form of a poster.
• In the same small groups, students evaluate and comment on sample responses, identifying the strengths and weaknesses in these responses and comparing them with their own work.
• In a whole-class discussion students compare and evaluate the strategies they have seen and used.
• In a follow-up lesson, students reflect for 10 minutes on their work and what they have learned.

## Materials required

• Each individual student will need a copy of the assessment task: Baseball Jerseys, some plain paper, a mini-whiteboard, pen, and eraser, and a copy of the How Did You Work? questionnaire.
• Each small group of students will need a large sheet of paper, some felt tipped pens, and copies of Sample Responses to Discuss.
• Provide calculators and graph paper only when requested.
• There is a projector resource to support whole-class discussions.

## Time needed

15 minutes before the lesson, a 70-minute lesson (or split into two shorter ones), and 10 minutes in a follow-up lesson. Timings given are only approximate.

## Mathematical Practices

This lesson involves a range of mathematical practices from the standards, with emphasis on:

## Mathematical Content Standards

This lesson asks students to select and apply mathematical content from across the grades, including the content standards: