Pre-Algebra Chapter 6 - Ramsey School District
Pre-Algebra Chapter 6 - Ramsey School District
Pre-Algebra Chapter 6 - Ramsey School District
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Concept Check<br />
GUIDED PRACTICE KEY<br />
Guided Practice<br />
Applications<br />
1. OPEN ENDED Write a proportion that can be used to find the percent<br />
scored on an exam that has 50 questions.<br />
2. FIND THE ERROR Judie and Pennie are using a proportion to find what<br />
number is 35% of 21.<br />
Judie<br />
n 35<br />
= <br />
2 1 1 00<br />
Who is correct? Explain your reasoning.<br />
Use the percent proportion to solve each problem.<br />
Pennie<br />
2 1 35<br />
= <br />
n 1 00<br />
3. 16 is what percent of 40? 4. 21 is 30% of what number?<br />
5. What is 80% of 130? 6. What percent of 5 is 14?<br />
7. BOOKS Fifty-four of the 90 books on a shelf are history books.<br />
What percent of the books are history books?<br />
8. CHORES Refer to Example 5 on page 290. How many of the 1074 youths<br />
surveyed do not clean their room because they do not like to clean?<br />
Practice and Apply<br />
Homework Help<br />
For<br />
Exercises<br />
See<br />
Examples<br />
9–20 1, 2, 4, 6<br />
21, 23, 24 3<br />
22, 25 5<br />
Extra Practice<br />
See page 738.<br />
Use the percent proportion to solve each problem. Round to the nearest<br />
tenth.<br />
9. 72 is what percent of 160? 10. 17 is what percent of 85?<br />
11. 36 is 72% of what number? 12. 27 is 90% of what number?<br />
13. What is 44% of 175? 14. What is 84% of 150?<br />
15. 52.2 is what percent of 145? 16. 19.8 is what percent of 36?<br />
17. 14 is 12 1 2 % of what number? 18. 36 is 83 % of what number?<br />
4<br />
19. 7 is what percent of 3500? 20. What is 0.3% of 750?<br />
21. BIRDS If 12 of the 75 animals in a pet store are parakeets, what percent<br />
are parakeets?<br />
22. FISH Of the fish in an aquarium, 26% are angelfish. If the aquarium<br />
contains 50 fish, how many are angelfish?<br />
SCIENCE For Exercises 23 and 24, use the information in the table.<br />
23. What percent of the world’s<br />
World’s Fresh Water Supply<br />
fresh water does the Antarctic<br />
Source Volume (mi<br />
Icecap contain?<br />
)<br />
Freshwater Lakes 30,000<br />
24. RESEARCH Use the Internet or All Rivers 300<br />
another source to find the total Antarctic Icecap 6,300,000<br />
volume of the world’s fresh and<br />
salt water. What percent of the<br />
world’s total water supply does<br />
the Antarctic Icecap contain?<br />
Arctic Icecap and Glaciers<br />
Water in the Atmosphere<br />
Ground Water<br />
Deep-lying Ground Water<br />
680,000<br />
3100<br />
1,000,000<br />
1,000,000<br />
Total 9,013,400<br />
www.pre-alg.com/self_check_quiz<br />
Source: Time Almanac<br />
Lesson 6-5 Using the Percent Proportion 291
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