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Published byEvan Harmon Modified over 9 years ago
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“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
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Try these….
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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?
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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….?
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What is the difference between a ratio and a rate?
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RATIO DefinitionFacts/Characteristics Examples Non-Examples
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RATE DefinitionFacts/Characteristics Examples Non-Examples
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How can we determine the best deal? Which box is the better deal?
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Determine the price for 100g for each box. Which is the better buy?
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Lesson 3: Unit Rates Homework/Practice Pg. 123 # 1 - 9
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