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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
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Do Now 2/15/12

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  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

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