Practice B 8-5 - MrWalkerHomework

LESSON8-5Practice AEstimating with PercentsDetermine whether the numerator and denominator of afraction are compatible numbers. If not, change the appropriatenumber so the fraction has a numerator and denominator thatare compatible numbers. Estimates may vary.91. 1 3 2. 8 3. 1 01715not; 9not; 8 3 1 124 162 44. 1 7 5. 1 06 6. 201 9not; 4compatible; 1 06 1 not; 1 1 16202 8 3 77. 2 1 8. 69 9. 231 5compatible; 1 not; 6 1 compatible; 3 3 244 5 Estimate.10. 10% of 98 11. 5% of 21 12. 20% of 42about 1013. 14 out of 26 14. 33% of 25 15. 6 out of 29about 50%16. 25% of 33 17. 21% of 49 18. 30% of 36about 8 1 4 compatible; 1 1about 1about 8about 1019. Felicia spent $8.78 of her $10.00 weekly allowance.About what percent of her allowance did she spend?20. The Longview School marching band has earned $402of the $510 they need to buy new uniforms. About whatpercent of the money do they still need to earn?about 8about 20%about 12about 90%about 20%0 2 5 3 21. A restaurant bill for dinner is a total of $49.60. Estimatethe amount to leave as a 20% tip. about $10LESSON8-5Practice BEstimating with PercentsEstimate. Estimates may vary.1. 74 out of 99 2. 25% of 39 3. 52% of 10about 75%4. 21% of 50 5. 30% of 61 6. 10 out of 19about 107. 5 out of 26 8. 50% of 17.8 9. 16 out of 62about 20%Estimate each number or percent.10. 48% of 30 is about what number? 11. 9 is 26% of about what number?about 1512. About what number is 30% of 22? 13. 15 is 21% of about what number?about 7about 10about 20about 914. Rodney’s weekly gross pay is $91. He must pay about32% in taxes and deductions. Estimate Rodney’s weeklytake-home pay after deductions.15. In the last school election, 452 students voted. Maryreceived 219 votes. About what percent of the votesdid she receive?about 36about 7516. The gas tank of a car holds 20 gallons of gas. A gallonof gas cost $1.22. When the tank was filled it costs $20.About what percent of the tank was filled.about 5about 50%about 25%about $60about 50%about 80%17. The Boston Marathon, America’s oldest regularly contestedfoot race, is held on Patriots’ Day every April. The presentrace is a distance of a little more than 26 miles. If a runnercompletes only 21 miles of the race, about what percent ofthe race was run? about 80%Copyright © by Holt, Rinehart and Winston.47 Holt Middle School MathAll rights reserved.Copyright © by Holt, Rinehart and Winston.48 Holt Middle School MathAll rights reserved.LESSON8-5Practice CEstimating with PercentsEstimate each number or percent. Estimates may vary.1. 90% of 388 is about what number? 2. 32% of 449 is about what number?about 350about 1503. About what number is 19% of 60? 4. About what number is 29% of 67?about 12about 215. 71 is 9.8% of about what number? 6. About what percent of 178 is 87?about 710about 50%7. 31 is 39% of about what number? 8. 74% of 59 is about what number?about 75about 459. About what percent of 902 is 241? 10. About what number is 18.7% of 98?about 25%about 2011. 14.3 is about what percent of 74.6? 12. About what percent of 226 is 72?about 20%about 30%13. A stock on the New York Stock Exchange opens at $45.02and closes for the day at $50.18. About what percent of anincrease in price is this?14. A driver made a delivery of 462 boxes to a localmanufacturing company. She was able to unload 348 ofthe boxes before lunch. About what percent of the boxeswere left to be unloaded?15. The National Football League College Draft is held inthe spring of each year. In the 2001 draft, Michael Vickfrom Virginia Tech was drafted first by the Atlanta Falcons.There were 17 other underclassmen chosen among thefirst 62 selections. About what percent of the first playersselected were underclassmen?about 10%about 25%about 30%16. Utah, the 45th state to enter the union of the UnitedStates, is one of twelve states whose names begin withvowels. About what percent is this? about 25%LESSON8-5ReteachEstimating with PercentsYou can estimate the solutions to different types of problemsinvolving percents by rounding numbers.Type 1: Finding a percent of a number.Estimate 38% of 470.First, round the percent to a common percentwith an easy fractional equivalent.4038% 40% 1 2 005 Then, round the number to a number divisible bythe denominator of the fraction.470 500Use mental math to multiply. 2 • 500 Think: If 500 5 100, then 100 • 2 2005So, 38% of 470 is about 200.Complete to estimate each percent. Estimates may vary.1. 32% of 872Round to a percent with an easy fractional equivalent: 32% Round to hundreds place, divisible by 3: 872 Do mental math to multiply: 1 3 So, 32% of 872 is about 300 .9009003002. 78% of 495 3. 73% of 1175500 is divisibleby 5.33 1 3 % to easy fraction: % to easy fraction: 4 78% 80 % 5 73% 75 % 3 4 % 1 3 divisible by denominator:divisible by denominator:495 5001175 1200Do mental math to multiply.Do mental math to multiply. 4 3 5 500 4004 1200 900So, 78% of 495 is about 400 . So, 73% of 1175 is about 900 .Copyright © by Holt, Rinehart and Winston.49 Holt Middle School MathAll rights reserved.Copyright © by Holt, Rinehart and Winston.50 Holt Middle School MathAll rights reserved.Copyright © by Holt, Rinehart and Winston.94 Holt Middle School MathAll rights reserved.