Solving proportions
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Solving Proportions. Section 5.2. Objectives. Determine whether a proportion is true or false Solve a proportion. Objective 1: Determine whether a proportion is true or false. Objective 1. Proportions states two ratios are equal

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Solving Proportions

Section 5.2


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Objectives

  • Determine whether a proportion is true or false

  • Solve a proportion


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Objective 1: Determine whether a proportion is true or false


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Objective 1

  • Proportions states two ratios are equal

  • Cross multiplication – checks whether proportion is true or false

    • Cross multiplication is shortcut for converting both fractions to have common denominator and checking that numerators match


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Objective 1

  • To check whether proportion is true or false

    • Check that ratios or rates have same units

    • Cross multiply

    • If cross products are equal, proportion is true


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Objective 2:Solve a proportion


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Objective 2

  • If three numbers of proportion are given, you can find the fourth

  • To solve a proportion

    • Cross multiply

    • Do related division to find missing number