module 2 lesson 15
TRANSCRIPT
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Multiplication and Division of Rational Numbers
Do Now: Do Lesson 13 Exit Ticket
11/25/13Module 2, Lesson 15
Homework: Lesson 15 Problem Set
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Problem Set Solutions
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Two minutes
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Switch papers and solve your partner's question.
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Now change the word problem byreplacing the integers with
non-integer rational numbers(fractions or decimals), and write the
new equation.
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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.
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Problem Set #4
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Extra Examples
1.)
2.) -4 ÷ 1 25
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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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