1. “Cross Multiply and Divide” Can be used to determine the unknown value in any proportional reasoning problem For example…. Multiply these two 60 x 11 =10 x a 660 = 10 x aAnd now divide by 10 660 ÷ 10 = a 66 = a

2. Try these….

3. A recipe for salad dressing uses 60 mL of vinegar for 240 mL of oil. Emily has only 40 mL of vinegar. How much oil should she use?

4. Lesson 3: Unit Rates A rate is a ratio that is used to compare different kinds of quantities A unit rate describes how many units of the first type of quantity equals one unit of the second type of quantity Some common unit rates are…. – miles (or kilometers) per hour (km/h) – earnings per hour ($/h) – Can you think of any….?

5. What is the difference between a ratio and a rate?

6. RATIO DefinitionFacts/Characteristics Examples Non-Examples

7. RATE DefinitionFacts/Characteristics Examples Non-Examples

8. How can we determine the best deal? Which box is the better deal?

9. Determine the price for 100g for each box. Which is the better buy?

10. Lesson 3: Unit Rates Homework/Practice  Pg. 123 # 1 - 9