Download presentation

Presentation is loading. Please wait.

Published byEarl Merritt Modified over 4 years ago

1
Holt CA Course 1 6-3 Estimating with Percents Warm Up Warm Up California Standards California Standards Lesson Presentation Lesson PresentationPreview

2
Holt CA Course 1 6-3 Estimating with Percents Warm Up Write each percent as a fraction and as a decimal. 1. 75% 2. 10% 3. 32% 4. 17% 3434, 0.75, 0.1 10 1, 0.32 25 8, 0.17 100 17

3
Holt CA Course 1 6-3 Estimating with Percents NS1.4 Calculate given percentages of quantities and solve problems involving discounts at sales, interest earned, and tips. Also covered: NS2.1 California Standards

4
Holt CA Course 1 6-3 Estimating with Percents The table shows common percents and their fraction equivalents. You can estimate a percent of a number by substituting a fraction that is close to a given percent. Fraction Percent 10%20%25%50%33 % 1313 66 % 2323 1515 1414 1313 1212 2323 1 10

5
Holt CA Course 1 6-3 Estimating with Percents 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% of 45 =10% of 45 = To find 1% of a number, move the decimal point two places to the left. To find 10% of a number, move the decimal point one place to the left... 0 45. 45.

6
Holt CA Course 1 6-3 Estimating with Percents Use a fraction to estimate 27% of 63. Additional Example 1: Using Fractions to Estimate Percents 27% of 63 1414 63 1414 60 15 27% of 63 is about 15. Compatible numbers are close to the numbers in the problem and help you use mental math to find a solution. Remember! Think: 27% is about 25% and 25% is equivalent to. 1414 Change 63 to a compatible number. Multiply.

7
Holt CA Course 1 6-3 Estimating with Percents Tara’s T’s is offering 2 T-shirts for $16, while Good-T’s is running their buy one for $9.99, get one for 50% off sale. Which store offers the better deal? Additional Example 2: Consumer Math Application First find the discount price for 2 t-shirts at Good T’s. 50% of $9.99 = 1212 $9.99 1212 $10 $5 The second shirt cost approximately $5. Since $10 + $5 = $15, the 2 T-shirts for $15 at Good-T’s is the better deal. Think: 50% is equivalent to. 1 2 Change $9.99 to a compatible number. Multiply.

8
Holt CA Course 1 6-3 Estimating with Percents Use 1% or 10% to estimate the percent of each number. Additional Example 3: Estimating with Simple Percents A. 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% of 18 is about 0.8. 4% equals 4 · 1%..

9
Holt CA Course 1 6-3 Estimating with Percents Use 1% or 10% to estimate the percent of each number. Additional Example 3: Estimating with Simple Percents B. 29% of 80 29% is about 30, so find 30% of 80. 10% of 80 = 80. 30% of 80 = 3 8.0 = 24.0 29% of 80 is about 24. 30% equals 3 · 10%..

10
Holt CA Course 1 6-3 Estimating with Percents Tim spent $58 on dinner for his family. About how much money should he leave for a 15% tip? Additional Example 4: Consumer Math Application 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 2. 1212 Add the 10% and 5% estimates.

11
Holt CA Course 1 6-3 Estimating with Percents Use a fraction to estimate 48% of 91. Check It Out! Example 1 48% of 91 1212 91 1212 90 45 48% of 91 is about 45. Think: 48% is about 50% and 50% is equivalent to. 1212 Change 91 to a compatible number. Multiply.

12
Holt CA Course 1 6-3 Estimating with Percents Check It Out! Example 2 First find the discount on the notebook at Billy’s Office Supply. 25% of $9.75 = 1414 $9.75 1414 $10 $2.50 The discount is approximately $2.50. Since $10 – $2.50 = $7.50, the notebook from K’s Office Supply Store is the better deal. Think: 25% is equivalent to. 1 4 Change $9.75 to a compatible number. Multiply. Billy’s Office Supply Store is offering 25% off a leather notebook, originally priced at $9.75. K’s Office Supply Store offers the same notebook, not on sale, at $7.00. Which store offers the better deal?

13
Holt CA Course 1 6-3 Estimating with Percents Use 1% or 10% to estimate the percent of each number. Check It Out! Example 3 A. 5% of 14 14 is about 15, so find 5% of 15. 1% of 15 = 15. 5% of 15 = 5 0.15 = 0.75 5% of 14 is about 0.75. 5% equals 5 · 1%..

14
Holt CA Course 1 6-3 Estimating with Percents Amanda spent $12 on a hair cut. About how much money should she leave for a 15% tip? Check It Out! Example 4 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 2. 1212 Add the 10% and 5% estimates.

15
Holt CA Course 1 6-3 Estimating with Percents Lesson Quiz 1. Use a fraction to estimate 48% of 72. 2. A café is offering 10% off the $4.99 lunch. If a diner is offering the same lunch for $4.59, which is offering the better deal? Use 1% or 10% to estimate the percent of each number. 3. 4% of 220 4. 19% of 75 5. Mr. and Mrs. Dargen spend $46.25 on a meal. About how much should they leave for a 15% tip? the café 36 8.8 15 $7 Possible answers:

Similar presentations

© 2019 SlidePlayer.com Inc.

All rights reserved.

To make this website work, we log user data and share it with processors. To use this website, you must agree to our Privacy Policy, including cookie policy.

Ads by Google