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.
• Interpret and evaluate the data generated.
• Communicate their reasoning clearly.

Introduction       

This lesson is designed to enable students to develop strategies for solving real-life problems. The problem is characterized by the use of appropriate units and formulas.

• Before the lesson, students tackle the problem individually. You assess their responses and formulate questions that will prompt them to review their work.
• At the start of the lesson, students respond individually to the questions set, and then work in groups to combine their thinking and produce a collaborative solution in the form of a poster.
• In the same small groups, students evaluate and comment on some sample responses. They identify the strengths and mistakes in these responses and compare them with their own work.
• In a whole-class discussion, students explain and compare the solution strategies they have seen and used.
• Finally, students reflect on their work and their learning.

Materials required

Each student will need a calculator, a copy of Making Matchsticks, a copy Formula Sheet, a blank sheet of paper, and a copy of the questionnaire How Did You Work?

Each small group of students will need a large sheet of paper for making a poster, felt tipped pens, and copies of Sample Responses to Discuss.

There are some projector resources to help you with whole-class discussions.

Time needed

15 minutes before the lesson, a 90-minute lesson and 15 minutes for follow-up lesson or for homework. Timings given are only approximate. Exact timings will depend on the needs of the class.