Percet Proportions成比例的.pptVIP

Percent Proportions (Day 1) * We are learning to…find parts, totals and percents using proportional reasoning. Vocabulary… Percent – A number that is expressed out of a total of 100. PERCENT Percent Proportions Percent Proportions Percent Proportions Group Practice As you work today look for clues: “of” will typically indicate a total “is” usually indicates a part A “%” symbol of course indicates a percent. Analyze the question carefully before starting…identify the part, total and percent before starting to solve. Set up a proportion and then use your equation solving skills to find your solution. Try to simplify the ratios in your proportional equations if possible. Write your solution in the form of a sentence. What number is 45% of 20? 44 0.0225 9 8 I need help with this question. 36 is 24% of what number? 150 8.64 146 60 I need help with this question. What percent is 3 of 20? 17% 666.6% 3% 15% I need help with this question. * * “for every… 100” Situation: What percent is 2 out of a total of 5? Part Total What is this question asking us to find? …The Percent (100) (100) 2 is 40% of 5. When setting up your tables today think of the relationships in terms of parts and totals. Parts Totals 2 5 x 100 Table: Proportion and Solution Process: Solution: Situation: What number is 14% of 300? Part Total What is this question asking us to find? …The Part! (14) (14) 42 is 14% of 300. When setting up your tables today think of the relationships in terms of parts and totals. Parts Totals x 300 14 100 Table: Proportion and Solution Process: Solution: Situation: 60 is 75% of what number? Part Part What is this question asking us to find? …The Total! (60) (60) 60 is 75% of 80. When setting up your tables today think of the relationships in terms of parts and totals. Parts Totals 60 x 75 100 Table: Proportion and Solution Process: Solution: 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9