Unit 5, Lesson 9# Multiplying Rational Numbers

Open Up Resources 50 min(s)

The purpose of this lesson is to develop the rules for multiplying two negative numbers. They interpret negative time as time before a chosen starting time and then figure out what the position is of an object moving with a negative velocity at a negative time. Understand and explain why the product of two negative numbers is positive. Understand and explain why the product of two negative numbers is positive.