Estimation
FDP Conversion
Surprise!
Shopping!
Money
100
How would you estimate 8% of 261?
Use 10%. 8% of 261 is approximately 26.
100
What fraction (in lowest terms) is the following percent: 2.70%
What is 2 7/10.
100
What is 155% of 52?
The answer is 80.6.
100
You want to buy some more gum (you have chewed it all in class this week). The gum costs $1.99 plus 8.5% tax. What does the gum cost you (besides another warning in class!)?
What is $2.16.
100
Melina is planning a budget. She wants to spend less than 35% of her allowance on entertainment. Each week she gets $20. Last week, Melina spent $7.42 on iTunes. Did she stay within her budget?
Melina spent 37.1% of her allowance on iTunes. She was close, but didn't stay within her budget.
200
How would you estimate 83% of 70?
Use 4/5. 80 divided by 5 is 14. 14 x 4 = 56.
200
During class, Alex finished 63% of his homework and Jessica finished 5/7 of her homework. Who must finish more homework at home?
Jessica has finished abut 71% of her homework. She will have about 29% to do at home. Alex will have to do about 37% at home. The answer is Alex.
200
Which value is NOT equivalent to 45% a. 9/20 b. 0.45 c. 27/60 d. 0.045
What is d. 0.045. 0.045 would be 4.5% not 45%.
200
You need new baseball cleats. You find a pair on sale for 27% off at Sports Authority. The original price is $30. What is the price after the discount?
They cost $21.90.
200
Jackson spends 7% of his annual income on his car. He pays $2,905 a year in car payments, insurance, and gas. How much money does Jackson make each year?
Jackson makes $41,500 per year.
300
Estimate 78% of 90.
This is close to 3/4 (75%). So if you divide 90 by 4 you get about 23. Then multiply by 3, and you get 69. Acceptable answers: 69 to 72.
300
Which inequality is a true statement? a. 24% > 1/4 b. 0.76 < 76% c. 8% < .8 d. 1/5 < 5%
What is c. 8% < .8 (.8 = 80%)
300
Explain why it might be important to know whether your estimate of a percent is too high or too low. Give an example.
Possible Answer: If you are at a store and trying to figure out if you have enough money to buy something it would be important to know if your estimate was too high or too low.
300
At Best Buy this week, the Sony Reader pocket edition (in pink) is on sale for $169.99. Normally, this item costs $199.99. What percent off are you getting if you buy it this week?
What is about 15%. Remeber, if you divide 169.99 by 199.99 you find the percent you are paying!
300
Raging Waters costs $25 for admission. You pay the cashier $30, and get $3.75 in change. What is the sales tax rate?
The tax rate is 5%.
400
The new package of hot hot cheesy curls has 25% more snacks. If the old package contained 22 oz of curls, about how many oz does the new package contain?
Divide 22 by 4, which is about 5. Add 22 + 5 to get 27 oz.
400
Rain forests are home to 90,000 of the 250,000 identified plant species in the world. what percent of the world's identified plant species are found in the rain forest?
What is 36%
400
What is the error? A student used the proportion n/100 = 5/26 to find 5% of 26.
The percent always goes over 100. So the student should have made the proportion n/26 = 5/100.
400
The Justin Bieber CD is on sale this week for $7.99. This is about 25% off of the regular price. What is the regular price?
The regular price is $10.65.
400
When you buy sunscreen in Santa Cruz, the original cost is $10. After taxes you pay $10.83. What is the tax rate in Santa Cruz?
The tax rate is 8.3%
500
How did you get this estimate? 63% of 39 = 24.
63 is about 60. 39 is about 40. 50% of 40 is 20. 10% of 40 is 4. 20 + 4 = 24.
500
A desert area's average rainfall is 12 inches a year. This year the area received 15 inches of rain. What percent of the average rainfall amount is 15 inches?
What is 125%
500
Melanie's room measures 10 ft. by 12 ft. Her rug covers 90 sq. ft. Explain how to determine the percent of floor covered by the rug.
First find the are of the room 10 x 12 = 120 sq. ft. Then write a ratio of rug to total floor = 90/120. Then divide to find the decimal 0.75. Change the decimal to a percent. 0.75 = 75%
500
A pair of jeans that regularly cost $25.50 are on sale for $5.10 off the regular price. What is the percent of discount on jeans?
The jeans are 20% off.
500
Kayleigh has been offered two jobs! The first job has an annual salary of $32,000. The second job offers an annual salary of $10,000 plus 8% commission on all of her sales. How much money per year would Kayleigh need to make in sales to earn enough commission to make more money at the second job?
What is more than $275,000 per year in sales.
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