1 / 11

Do Now 2/15/12

Do Now 2/15/12. Take out HW from last night. Punchline worksheet #92 Copy HW in your planner. Text p. 238, #12-42 evens

jeremy-baker
Télécharger la présentation

Do Now 2/15/12

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. Do Now 2/15/12 • Take out HW from last night. • Punchline worksheet #92 • Copy HW in your planner. • Text p. 238, #12-42 evens • In your journal, answer the following question. A basketball costs $14.99 at Modell’s. Sports Authority is offering the same basketball at 20% off the regular price of $19.99. Estimate to determine which store is offering the better deal?

  2. Punchline worksheet 92 “What Were the Crash Dummy’s Last Words?” GIVE ME A BRAKE “Why Did the Little Boy Wear a Sheet to Go Trick-or-Treating?” HE WAS DRESSED UP AS A MATTRESS

  3. Objective • SWBAT estimate percents

  4. Section 6.2 “Estimating with Percents” • You can use fractions or decimals to estimate with percents.

  5. Estimating Percents with Fractions You can estimate the percent of a number by substituting a fraction that is close to a given percent. A basketball costs $14.99 at Modell’s. Sports Authority is offering the same basketball at 20% off the regular price of $19.99. Estimate to determine which store is offering the better deal? Find 20% of $19.99 Compatible numbers – numbers that are close and help you use mental math to find the solution

  6. Finding Percent ofa Number Use a fraction and compatible numbers to estimate the percent of each number. means multiplication Find 25% of 35. 1 4 25% Find 34% of 63. 1 3 34% Find 8% of 261. 1 10 8%

  7. Estimating Percents with Decimals Another way to estimate percents is to find 1% or 10% of a number. You can do this by moving the decimal point in the number. 10% 1% Find of any number by moving the decimal point 1 place to the left. Find of any number by moving the decimal point 2 places to the left. Find 10% of 45 Find 1% of 45 45 .0 = 4.5 45 .0 = 0.45

  8. Use 1% or 10% to estimate the percent of each number. Find 4% of 18 18 is about 20, so find 4% of 20. 1% of 20 = 20. . 4% of 20 = 4 · 0.2 = 0.8 4% equals 4 · 1%. 4% of 18 is about 0.8. Find 29% of 80 29% is about 30, so find 30% of 80. 10% of 80 = 80. . 30% of 80 = 3 · 8.0 = 24.0 30% equals 3 · 10%. 29% of 80 is about 24.

  9. 1 2 5% is of 10% so divide $6 by 2. Real-Life Application Tim spent $58 on dinner for his family. About how much money should he leave for a 15% tip? Since $58 is about $60, find 15% of $60. Think: 15% is 10% + 5%. 15% = 10% + 5% 10% of $60 = $6 5% of $60 = $6 ÷ 2 = $3 $6 + $3 = $9 Add the 10% and 5% estimates. Tim should leave about $9 for a 15% tip.

  10. 1 2 5% is of 10% so divide $1 by 2. Real-Life Application Amanda spent $12 on a hair cut. About how much money should she leave for a 15% tip? Since $12 is about $10, find 15% of $10. Think: 15% is 10% + 5%. 15% = 10% + 5% 10% of $10 = $1 5% of $10 = $1 ÷ 2 = $0.50 $1 + $0.50 = $1.50 Add the 10% and 5% estimates. Amanda should leave about $1.50 for a 15% tip.

  11. Homework NJASK7 Prep • Text p. 238, #12-42 evens

More Related