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Do Now 2/15/12 Take out HW from last night. Take out HW from last night. Punchline worksheet #92 Punchline worksheet #92 Copy HW in your planner. Copy.

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Presentation on theme: "Do Now 2/15/12 Take out HW from last night. Take out HW from last night. Punchline worksheet #92 Punchline worksheet #92 Copy HW in your planner. Copy."— Presentation transcript:

1 Do Now 2/15/12 Take out HW from last night. Take out HW from last night. Punchline worksheet #92 Punchline worksheet #92 Copy HW in your planner. Copy HW in your planner. Text p. 238, #12-42 evens 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 $ Estimate to determine which store is offering the better deal? 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 $ 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 SWBAT estimate percents

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

5 Estimating Percents with Fractions Percent10%20%25% 33 % 50% 50% 66 % Fraction 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 $ Estimate to determine which store is offering the better deal? A basketball costs $14.99 at Modell’s. Sports Authority is offering the same basketball at 20% off the regular price of $ 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 Use a fraction and compatible numbers to estimate the percent of each number. means multiplication 25% 1 4 Find 25% of % 1 3 Find 34% of 63. Finding Percent of a Number 8% 110 Find 8% of 261.

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. 1% Find of any number by moving the decimal point 2 places to the left. 10% Find of any number by moving the decimal point 1 place to the left. Find 1% of = Find 10% of = 4.5.0

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

9 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. 15% = 10% + 5% 10% of $60 = $6 5% of $60 = $6 ÷ 2 = $3 $6 + $3 = $9 Tim should leave about $9 for a 15% tip. Think: 15% is 10% + 5%. 5% is of 10% so divide $6 by Add the 10% and 5% estimates.

10 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. 15% = 10% + 5% 10% of $10 = $1 5% of $10 = $1 ÷ 2 = $0.50 $1 + $0.50 = $1.50 Amanda should leave about $1.50 for a 15% tip. Think: 15% is 10% + 5%. 5% is of 10% so divide $1 by Add the 10% and 5% estimates.

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


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