1 / 12

Lesson 4-3 Proportions and Percent Equations

Lesson 4-3 Proportions and Percent Equations. Objective: To use proportions when solving percent problems and to write and solve percent problems. …and why?. One example of a real world connection is to calculate the total water supply of the USA. PERCENT REMINDER.

arthur-pierce
Download Presentation

Lesson 4-3 Proportions and Percent Equations

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Lesson 4-3Proportions andPercent Equations Objective: To use proportions when solving percent problems and to write and solve percent problems.

  2. …and why? • One example of a real world connection is to calculate the total water supply of the USA.

  3. PERCENT REMINDER • A percent is a ratio comparing a number to 100. • USE THE FOLLOWING PROPORTION FOR SOLVING PERCENT PROBLEMS: ‘ N* ‘= ‘ part ‘ 100 whole *N/100 is the percent.

  4. Finding the percent. Ex. 1) What percent of 40 is 30? Finding the part. Ex. 2) Find 30% of 40. Examples 1 & 2, page 197

  5. Example 3, page 198 • Ex. 3 – Charlie worked 31.5 hours at a hospital as a volunteer. This represents 87.5% of the school’s requirement for community service. How many hours does his school require for community service?

  6. Percent Equations • Key Words • “What …” is the unknown. Use x. • “Is” means =. • “Of” means to multiply.

  7. A) What is 85% of 320? B) 393 is 60% of what number? Ex. 4, page 198Write and solve a percent equation.

  8. Ex. 5a) 105 is 125% of what number. Ex. 5b) What percent of 320 is 1.6? Ex. 5c) 640 is what percent of 32? Ex. 5d) 0.13% of what number is 3000? Example 5, page 199Find each number or percent.

  9. Ex. 6a) 49% of 280 is what number? Ex. 6b) What is 65% of 334? Ex. 6c) What is 74.2% of 44? Ex. 6d) 11% of 521 is what number? Using Estimation, page 199Use fractions to estimate.

  10. Example 7, page 200 A store advertises sneakers on sale for 33% off. The original price of sneakers is $56. • A) Estimate the amount the sneakers have been marked down. • B) Estimate the sale price of the sneakers.

  11. SUMMARY TO SOLVE PERCENT PROBLEMS either • Use a percent proportion N/100 = part/whole Or • A percent equation where “is” means = and “of” means to multiply.

  12. Assignment P. 200 1 – 57 odd; 61 – 73 odd

More Related