04/13/2010 Proportion and Percent #23
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Pre-Algebra 8-4 Percent Increase and Decrease 04/13/2010 Proportion and Percent #23 Today’s Plan: -Warm-Up -Percent Increase and Decrease -Assignment LT: I will apply my understanding of ratios to solve problems involving proportional relationships, including percent. Warm Up : Answer as many as possible without looking at your notes. Then use your notes to finish. Percent Fraction (lowest terms) 1 . 10% 2 . 1/4 3 . 60% 4 . 1 5 . 2/3 6 . 75% 7 1/6 Percent Fraction (lowest terms) 8. 1/2 9. 80% 10. 90% 11. 3/8 12. 87.5% 13. 1/8 14. 30%
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04/13/2010 Proportion and Percent #23. Warm Up : Answer as many as possible without looking at your notes. Then use your notes to finish. LT: I will apply my understanding of ratios to solve problems involving proportional relationships, including percent. Today’s Plan: -Warm-Up - PowerPoint PPT Presentation
Transcript of 04/13/2010 Proportion and Percent #23
Pre-Algebra
8-4 Percent Increase and Decrease 04/13/2010 Proportion and Percent #23
Today’s Plan:-Warm-Up-Percent Increase and Decrease -Assignment
LT: I will apply my understanding of ratios to solve problems involving proportional relationships, including percent.
Warm Up: Answer as many as possible without looking at your notes. Then use your notes to finish.
Percent Fraction (lowest terms)
1. 10%
2. 1/4
3. 60%
4. 1
5. 2/3
6. 75%
7. 1/6
Percent Fraction (lowest terms)
8. 1/2
9. 80%
10. 90%
11. 3/8
12. 87.5%
13. 1/8
14. 30%
Pre-Algebra
8-4 Percent Increase and Decrease 04/13/2010 Proportion and Percent #23
Today’s Plan:-Warm-Up-Percent Increase and Decrease -Assignment
LT: I will apply my understanding of ratios to solve problems involving proportional relationships, including percent.
White boards
Pre-Algebra
8-4 Percent Increase and Decrease
A. Sarah bought a DVD player originally priced at $450 that was on sale for 20% off. What was the sale price?
Multi-Step Percent Problems
$450 20% First find 20% of $450.
$450 0.20 = $90 20% = 0.20
The amount of decrease is $90.
Think: The reduced price is $90 less than $450.
$450 – $90 = $360 Subtract the amount of decrease.The sale price of the DVD player was $360.
Pre-Algebra
8-4 Percent Increase and Decrease
B. Mr. Olsen has a computer business in which he sells everything at 40% above the wholesale price. If he purchased a printer for $85 wholesale, what will be the retail price?
Additional Example 3B: Percent Increase and Decrease
$85 40% First find 40% of $85.
$85 0.40 = $34 40% = 0.40
The amount of increase is $34.
Think: The retail price is $34 more than $85.
$85 + $34 = $119 Add the amount of increase.
The retail price of this printer will be $119.
Pre-Algebra
8-4 Percent Increase and Decrease
A. Lily bought a dog house originally priced at $750 that was on sale for 10% off. What was the sale price?
Try This: Example 3A
$750 10% First find 10% of $750.
$750 0.10 = $75 10% = 0.10
The amount of decrease is $75.
Think: The reduced price is $75 less than $750.
$750 – $75 = $675 Subtract the amount of decrease.
The sale price of the dog house was $675.
Pre-Algebra
8-4 Percent Increase and Decrease
B. Barb has a grocery store in which she sells everything at 50% above the wholesale price. If she purchased a prime rib for $30 wholesale, what will be the retail price?
$30 50% First find 50% of $30.
$30 0.50 = $15 50% = 0.50
The amount of increase is $15.
Think: The retail price is $15 more than $30.
$30 + $15 = $45 Add the amount of increase.
The retail price of the prime rib will be $45.
Try This: Example 3B
Pre-Algebra
8-4 Percent Increase and Decrease 04/13/2010 Proportion and Percent #23
Today’s Plan:-Warm-Up-Percent Increase and Decrease -Assignment
LT: I will apply my understanding of ratios to solve problems involving proportional relationships, including percent.
Worksheet
