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2 ch5l1 2 ch5l1 Presentation Transcript

  • In basketball practice. Kathlene made 17 baskets in 25 attempts. She compared the number of baskets she made to the total number of attempts she made by using the ratio . A ratio is a comparison of two quantities by division. 17 25 Kathlene can write her ratio of baskets made to attempts in three different ways . 17 25 17 to 25 17:25 Course 2 5-1 Ratios
  • Twenty students are asked to choose their favorite music category. Eight chose pop, seven chose hip hop, and five chose rock. Write each ratio in all three forms. Additional Example 1: Writing Ratios A. rock to hip hop 5 7 , 5 to 7, 5:7 The ratio of rock to hip hop is 5 to 7, which can be written as follows: B. hip hop to pop The ratio of hip hop to pop is 7 to 8, which can be written as follows: 7 8 , 7 to 8, 7:8 Course 2 5-1 Ratios
  • Sometimes a ratio can be simplified . To simplify a ratio, first write it in fraction form and then simplify the fraction. Course 2 5-1 Ratios
  • To compare ratios, write them as fractions with common denominators. Then compare the numerators. Course 2 5-1 Ratios
  • Honey-lemon cough drops come in packages of 30 drops per 10-ounce bag. Cherry cough drops come in packages of 24 drops per 6-ounce bag. Compare the ratio of drops per ounces for each bag of cough drops. Additional Example 3: Comparing Ratios Honey-lemon: drops ounces = 30 10 = 3 1 Cherry: drops ounces = 24 6 = 4 1 Because 4 > 3 and the denominators are the same, the drops to ounces is greater in the bag of cherry cough drops. Write the ratios as fractions with common denominators. Course 2 5-1 Ratios 6 10 Ounces 24 30 Drops Cherry Honey-lemon
  • Lesson Quiz: Part I A coin bank contains 16 quarters, 12 dimes, and 8 nickels. Write the given ratio in all three forms. Insert Lesson Title Here 1. nickels to quarters 2. dimes to nickels 3. nickels and dimes to quarters Course 2 5-1 Ratios 8 16 , 8 to 16, 8:16 or 1 2 , 1 to 2, 1:2 12 8 , 12 to 8, 12:8 or 3 2 , 3 to 2, 3:2 20 16 , 20 to 16, 20:16 or 5 4 , 5 to 4, 5:4
  • Lesson Quiz: Part II Insert Lesson Title Here 4. There are 220 calories in 5 crackers. Write the ratio of calories to crackers in all three forms. Write your answers in simplest form. 5. On a school trip, Bus 1 has 3 teachers and 14 students. Bus 2 has 4 teachers and 28 students. Which bus has the greater ratio of teachers to students? Bus 1 Course 2 5-1 Ratio 44 calories 1 cracker , 44 to 1, 44:1