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Published byEric Henry Modified over 9 years ago
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Warm Up What property is each showing? (a + b) + c = a + (b + c) a (b + c) = ab + ac a + b = b + a (a ∙ b) ∙ c = a ∙ (b ∙ c) ab = ba Distributive Commutative Prop. Of Addition Commutative Prop. Of Multiplication Associative Prop. Of Addition Associative Prop. Of Multiplication
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What is a ratio? …a comparison of two quantities
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Ratios can be written in three ways: Using the word “to8 to 12 With a colon8 : 12 As a fraction8 12
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Write the ratio of the number of boys in our room to the number of girls. Using the word “to With a colon As a fraction Do you get the same ratio if you compare the number of girls to the number of boys?
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A pet store has 4 puppies, 2 kittens, 5 birds, and 3 hamsters. Write the ratio of kittens to birds in 3 ways. Write the ratio of puppies to all animals in three ways.
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Equal Ratios What do you think they are?? Two ratios are equivalent if they can be written as equivalent fractions.
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Equal Ratios How can you tell if two ratios are equal? The answer : Cross Products!
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496 to 8, 15 to 20 510 3:4, 18:24 CHECKPOINT Tell whether the ratios are equivalent using cross products.
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Equal Ratios Fire Hydrants to City Blocks 2 3
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State an equal ratio to… all in different forms 5:93/8 60 to 100 1: 13
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State an equal ratio to… all in different forms For every 12 pie slices sold at the Circus Café, 4 are cherry. Find one equal ratio using multiplication and one using division.
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Homework TB p385 #9a,b.c TB p388 1-4, 9-17
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