Unit 7, Lesson 15
Multiply!
Accelerated 6
Preparation
Lesson Narrative
This lesson provides opportunities for additional practice with multiplying rational numbers.
The first activity uses the structure of the coordinate grid to reveal patterns that reinforce what students have learned about multiplying signed numbers. Next, students sort multiplication expressions and match the expressions that have the same value. Then they calculate the product of expressions and compare answers with their partner.
Some of the expressions involve fractions or decimals. Multiplying by a unit fraction serves as a bridge to the next lesson in which students will divide rational numbers. Also, some of the expressions have three different factors, so students can apply the associative property. Regardless of which two factors students choose to multiply first, multiplying that product by the remaining factor will result in the same answer.
- Identify multiplication expressions that are equal, and justify (orally) that they are equal.
- Multiply rational numbers, including multiplication expressions with three factors, and explain (orally and in writing) the reasoning.
Let's get more practice multiplying signed numbers.
Required Preparation
For the digital version of the activity, acquire devices that can run the applet.
Copy each set of cards on a different color of paper so they can easily be sorted for the next class.