Lesson Study Research Lesson: Teaching subtraction of integers

This year, we introduced Lesson Study to the mathematics teachers of Sta Lucia High School, a public school in Pasig City, Philippines. I am working with a group of 5 teachers, all teaching Mathematics I (Year 7 maths). We implemented the lessons last month and with their permission I am sharing the latest version of the lesson. Note that while the objective of the lesson is for students to understand subtraction of integers, the lesson was also so designed to develop students mathematical thinking skills and thinking habits.

1. Representing integers with chips.

Representing integers using + and - chips

2. From ‘chips representations’ to number sentences.

'Chips representations' to number sentences

3. Taking away integers using chips. Read more of this post

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