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7.1 The Concept of Ratio

7.1 The Concept of Ratio. Remember to Silence Your Cell Phone and Put It In Your Bag!. Definition of Ratio. A ratio is a comparison of two numbers by division The divisor or denominator cannot be zero A ratio may be written as: x to y  x : y x  y . Equivalent ratios.

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7.1 The Concept of Ratio

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  1. 7.1 The Concept of Ratio Remember to Silence Your Cell Phone and Put It In Your Bag!

  2. Definition of Ratio • A ratio is a comparison of two numbers by division • The divisor or denominator cannot be zero • A ratio may be written as: • x to y x : y • x  y 

  3. Equivalent ratios • Two ratios a to b and c to d are equivalent ratios if their respective fractions are equivalent or • Two ratios a  b and c  d are equivalent ratios if the quotients of the respective terms are the same

  4. Ratios • Ratios may compare like quantities or unlike quantities • Ratios should be reduced unless the application dictates otherwise

  5. Uses of Ratios • To compare like quantities • part to part • part to whole • whole to part

  6. Uses of Ratios • To compare unlike quantities • Rates • “per” • Change in quantities wrt time – ex. speed • Unit pricing • Scale drawings • Costs of … • Sports’ Statistics

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