Download presentation

Presentation is loading. Please wait.

Published byChristy Bowler Modified over 2 years ago

1
**Do Now 2/15/12 Take out HW from last night. Copy HW in your planner.**

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 $ 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. Percent 10% 20% 25% 33 % 50% 66 % Fraction 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
**Finding Percent of a Number**

means multiplication Use a fraction and compatible numbers to estimate the percent of each number. 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
**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% Think: 15% is 10% + 5%. 10% of $60 = $6 5% is of 10% so divide $6 by 2. 1 2 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
**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% Think: 15% is 10% + 5%. 10% of $10 = $1 5% is of 10% so divide $1 by 2. 1 2 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
NJASK7 Prep Homework Text p. 238, #12-42 evens

Similar presentations

OK

Holt CA Course 1 6-3 Estimating with Percents NS1.4 Calculate given percentages of quantities and solve problems involving discounts at sales, interest.

Holt CA Course 1 6-3 Estimating with Percents NS1.4 Calculate given percentages of quantities and solve problems involving discounts at sales, interest.

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on chakras in human body Ppt on world environment day Ppt on origin of numbers Ppt on rational numbers for class 10 Ppt on disaster management in hindi Ppt on producers consumers and decomposers for kids Ppt on 5 pen pc technology free download Ppt on forward contract accounting Ppt on diode transistor logic gates Download ppt on nationalism in indochina