Exploring Rational Number Subtraction

• Math
• 7th Grade

Exploring Rational Number Subtraction

Learning Objective

Understand subtraction of rational numbers as adding the additive inverse, p-q=p+(-q).

What do you already know about subtracting rational numbers?

Review: Adding Rational Numbers

Recap on adding rational numbers with both like and unlike denominators.

Introduction to Subtraction

Discuss the concept of subtraction as the inverse operation of addition.

Subtraction as Adding the Additive Inverse

Demonstrate how to subtract rational numbers using the rule p-q=p+(-q).

Differentiated Practice: Basic Level

Engage in basic subtraction of rational numbers with common denominators.

Differentiated Practice: Intermediate Level

Apply subtraction of rational numbers with unlike denominators.

Real-World Context: Supermarket Shopping

Use a scenario of buying items at a supermarket to practice subtracting rational numbers.

Interactive Exercise: Peer Teaching

Students pair up to teach each other the concept of subtracting rational numbers.

Problem-Solving Challenge

Present complex word problems involving rational number subtraction.

Application: Budgeting Activity

Students create a budget and practice subtracting rational numbers to manage expenses.

Assessment: Formative Quiz

Conduct a short quiz to gauge students' understanding of subtracting rational numbers.

Reflection and Review

Reflect on the lesson and review key concepts of subtracting rational numbers.

Write down 3 things you learned in this lesson.

Have students enter three things they learned in this lesson. With this they can indicate their own learning efficiency of this lesson.

Write down 2 things you want to know more about.

Here, students enter two things they would like to know more about. This not only increases involvement, but also gives them more ownership.

Ask 1 question about something you haven't quite understood yet.

The students indicate here (in question form) with which part of the material they still have difficulty. For the teacher, this not only provides insight into the extent to which the students understand/master the material, but also a good starting point for the next lesson.