• • • ##### Device
• TI-Nspire™ CX/CX II
• TI-Nspire™ CX CAS/CX II CAS
• TI-Nspire™ Navigator™
• TI-Nspire™ Apps for iPad®
• TI-Nspire™
• TI-Nspire™ CAS
• ##### Software

TI-Nspire™
TI-Nspire™ CAS

3.2

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Middle Grades Math: Addition and Subtraction of Rational Numbers: Part 1
by Texas Instruments

#### Objectives

• Students will use interactive models and pattern blocks to model positive mixed numbers and the sums and differences of positive mixed numbers.
• Students will understand subtraction of mixed numbers as adding the additive inverse.

#### Vocabulary

• rational number
• equivalent fractions
• mixed numbers

#### About the Lesson

This lesson involves using pattern blocks to model addition and subtraction of positive mixed numbers for randomly generated numeric expressions.
As a result, students will:

• Use pattern blocks to model addition and subtraction of positive mixed numbers.
• Calculate sums and differences, and use the TI-Nspire to check the accuracy of their calculations.