1 / 12

warm-up

warm-up. Handout Monday & Tuesday – wk 2 Correcting pen out Correcting quizzes from Friday. Learn to find percent increase and decrease. amount of change original amount. percent change =. Percent change is the ratio of the amount of change to the original amount.

magda
Download Presentation

warm-up

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. warm-up • Handout • Monday & Tuesday – wk 2 • Correcting pen out • Correcting quizzes from Friday

  2. Learn to find percent increase and decrease.

  3. amount of change original amount percent change = Percent change is the ratio of the amount of change to the original amount. Percent increase describes how much the original amount increases. Percent decrease describes how much the original amount decreases.

  4. 4 16 amount of decrease original amount Find the percent increase or decrease from 16 to 12. This is percent decrease. 16 – 12 = 4 Think: What percent is 4 of 16?

  5. 4 16 = 0.25 = 25% From 16 to 12 is a 25% decrease.

  6. 5 20 amount of increase original amount Find the percent increase or decrease from 15 to 20. This is percent increase. 20 – 15 = 5 Think: What percent is 5 of 20?

  7. 5 20 = 0.25 = 25% From 15 to 20 is a 25% increase.

  8. amount of decrease 0.40 original amount 1.25 B. In 1999, a certain stock was worth $1.25 a share. In 2002, the same stock was worth $0.85 a share. What was the percent decrease? 1.25 – 0.85 = 0.40 Think: What percent is 0.40 of 1.25?

  9. 0.40 1.25 = 0.32 = 32% The value of the stock decreased by 32%.

  10. A. Sarah bought a DVD player originally priced at $450 that was on sale for 20% off. What was the sale price? $450 20% $450 0.20 = $90 The amount of decrease is $90. Think: The reduced price is $90 less than $450. $450 – $90 = $360 The sale price of the DVD player was $360.

  11. B. Mr. Olsen has a computer business in which he sells everything at 40% above the wholesale price. If he purchased a printer for $85 wholesale, what will be the retail price? $85 40% $85 0.40 = $34 The amount of increase is $34. Think: The retail price is $34 more than $85. $85 + $34 = $119 The retail price of this printer will be $119.

  12. Lesson Quiz Find each percent increase or decrease to the nearest percent. 1. from 12 to 15 2. from 1625 to 1400 3. from 37 to 125 4. from 1.25 to 0.85 5. A computer game originally sold for $40 but is now on sale for 30% off. What is the sale price of the computer game? 25% increase 14% decrease 238% increase 32% decrease $28

More Related