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

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Practice For Percent Icrease And Decrease.

**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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