Your Instructor During Office Hours

Think Ahead 2

Percentages

To prepare for the next week of class, you should fully understand and be able to answer the following questions. You can check your answers with the answer key posted on your instructor’s website or O drive to be sure you are correct. You can get help with this work from:

· your instructor during office hours

· the Algebra Alcove in Jones 147

· the MAC (the Math Assistance Center) in BH 700

· online tutorials such as http://www.wtamu.edu/academic/anns/mps/math/mathlab/beg_algebra/beg_alg_tut16_percent.htm

Write each term in the appropriate blank:

0.73, 73/100, cent, hundred, percent, per hundred

In the expression, 73%, the symbol % stands for ______. The word “percent” means “per______”, since the word root ______means 100 (as in the word centennial). So 73% means 73______. This could be written as the fraction: ______. It could also be written using a decimal: ______.

2. Rewrite the following as percents:
a. 50/100
b. 11/100
c. 0.25
d. 1.10 / 3. Rewrite the following as fractions:
a. 73%
b. 11%
c. 0.11
d. 0.56

A useful rule in working with percentages is, to change a number from a percent to a decimal

a) Move the decimal 1 place to the left

b) Move the decimal 2 places to the left

c) Move the decimal 1 place to the right

d) Move the decimal 2 places to the right

5. A useful rule in working with percentages is, to change a number from a decimal to a percent

a) Move the decimal 1 place to the left

b) Move the decimal 2 places to the left

c) Move the decimal 1 place to the right

d) Move the decimal 2 places to the right

6. Complete the table, which compares numbers in 3 forms: as a percent, as a decimal, and as a fraction:

percent / decimal / fraction / fraction reduced to lowest form
26% / 0.26 / 26/100 / 13/50
13%
1.50
99/100
3/4

7. 25% is equivalent to which of the following (circle all that apply)?

a) 1/4

b) 1/2

c) 2/4

d) 2/5

e) 2/8

f) 2.5/100

g) 25/100

h) 250/1000

8. Without using a calculator, determine which is the largest.

a) 20% of 10

b) 15% of 100

c) 10% of 1000

d) 5% of 10000