This document contains notes from a math lesson on multiplying and dividing rational numbers. It includes examples of problems and their solutions, as well as rules for determining the sign of the product or quotient based on the signs of the factors or dividend and divisor. There is a problem set for homework and an exam is scheduled for the following Tuesday.

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Multiplication and Division
of Rational Numbers
Do Now: Do Lesson 13 Exit Ticket
and Lesson 14 Exit Ticket
11/21/14
Module 2, Lesson 15
Homework: Lesson 15
Problem Set
Exam 3 Tuesday 11/25/14

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Exit Ticket from Lesson 13

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Exit Ticket from Lesson 14

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Problem Set Solutions S.74

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Two minutes
S.76

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Switch papers and solve your
partner's question.

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Now change the word problem by
replacing the integers with
non-integer rational numbers
(fractions or decimals), and write the
new equation.
S.76

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S.76
Multiply the absolute values of the two rational numbers.
If the two numbers (factors) have the same sign, their product is positive.
If the two numbers (factors) have opposite signs, their product is negative.

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Divide the absolute values of the two rational numbers.
If the two numbers (dividend and divisor) have the same sign, their quotient is positive.
If the two numbers (dividend and divisor) have the opposite signs,
their quotient is negative.
S.77

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Problem Set #4 S.80

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Extra Examples
1.)
2.) -4 ÷ 1 2
5

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S.77

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S.78

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S.78

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S.78

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S.79

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S.79

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Closing:
· When answering word problems today about the Grimes
Middle School Flower Fundraiser, how did you know
whether to multiply or divide?
· How did you know whether to express your answer as a
positive or negative number?
· In general, how does the context of a word problem
indicate whether you should multiply or divide rational
numbers, and how your answer will be stated?

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