# Percent/Scientific Notation Question Preview (ID: 437)

### Practice For Percent Icrease And Decrease. Answers? Play games to get them!

Simplify (3* 10 ^8)(7* 10^7)
a) 21*10^14
b) 2.1*10^16
c) 2.1*10^13
d) 0.21*10^12

The width of a plant cell has been measured as 1.276* 10^ -5 meters. How is this value written in standard form notation?
a) 0.00001276 meters
b) 0.0001276 meters
c) 0.001276 meters
d) 0.01276 meters

Find 1.53* 10^ -4
a) .000153
b) 153,000
c) .00000153
d) 15,300

Simplify 3(2.416* 10^ 2)
a) 7.248* 10 ^2
b) 7.248 * 10 ^5
c) 7.248* 10 ^ 6
d) 7.248* 30 ^ 2

Rewrite the number 0.000000437 using scientific notation.
a) 4.37* 10 ^ -7
b) 0.437 * 10 ^ -7
c) 0.437 * 10 ^7
d) 4.37 * 10 ^7

Max's parents bought a new car that cost \$18,575 before taxes. They paid \$1,532.44 in sales tax. What is the sales tax rate?
a) 8.25%
b) 8%
c) 7.5%
d) 8.375%

There are 400 students in Zack's school. 21% of the students are enrolled in choir. Of these, 75 are enrolled in band. How many students are enrolled in both choir and band?
a) 63 students
b) 84 students
c) 300 students
d) 384 students

Last year the Foreign Language Club had 25 members. This year it has 30 members. What is the percent increase in membership?
a) 20%
b) 16 2/3%
c) 75%
d) 83 1/3%

Walter is a waiter at the Towne Diner. He earns a daily wage of \$50 plus tips that are equal to 15% of the total cost of the dinner he serves. What was the total cost of the dinners he served on Tuesday if he earned \$170?
a) \$800
b) \$650
c) \$625
d) \$270

Teen birthrates in the U.S. declined from 62.1 births per 1,000 teenagers in 1991 to 48.5 in 2000. What is the percent of decrease?
a) 22%
b) 14%
c) 28%
d) 34%

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