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