Mastering Multiplication and Division in Scientific Notation

A scientist measures the mass of a small particle as 3.2 x 10^-9 grams. If she has 5 such particles, what is the total mass in grams, expressed in scientific notation?

• 6.4 x 10^-9 grams

• 1.6 x 10^-8 grams

• 1.0 x 10^-8 grams

• 3.2 x 10^-9 grams

A bacteria culture grows at a rate of 2.5 x 10^3 bacteria per hour. How many bacteria will there be after 4 hours? Express your answer in scientific notation.

• 1.0 x 10^4

• 1.5 x 10^5

• 5.0 x 10^3

• 2.5 x 10^4

A car travels a distance of 1.5 x 10^5 meters in 3 hours. What is the average speed of the car in meters per hour, expressed in scientific notation?

• 4.0 x 10^4

• 5.0 x 10^4

• 3.0 x 10^4

• 6.0 x 10^4

The volume of a small water bottle is 1.2 x 10^-2 cubic meters. If you have 10 such bottles, what is the total volume in cubic meters, expressed in scientific notation?

• 1.2 x 10^-2

• 1.2 x 10^0

• 1.2 x 10^-1

• 1.2 x 10^-3

A computer processes data at a speed of 4.0 x 10^6 bytes per second. How many bytes can it process in 2 minutes? Express your answer in scientific notation.

• 4.8 x 10^8

• 4.0 x 10^7

• 5.6 x 10^8

• 3.2 x 10^8

A researcher finds that a certain chemical reaction produces 6.4 x 10^4 molecules in one hour. How many molecules are produced in 5 hours? Express your answer in scientific notation.

• 1.6 x 10^5

• 3.2 x 10^5

• 2.4 x 10^5

• 4.8 x 10^5

A satellite orbits the Earth at a height of 3.6 x 10^7 meters. If it travels around the Earth 15 times, what is the total distance traveled in meters, expressed in scientific notation?

• 4.0 x 10^8

• 7.5 x 10^8

• 5.0 x 10^8

• 6.0 x 10^8

A factory produces 2.5 x 10^3 toys per day. How many toys does it produce in 30 days? Express your answer in scientific notation.

• 7.5 x 10^4

• 1.0 x 10^5

• 2.5 x 10^4

• 5.0 x 10^4

A light year is approximately 9.46 x 10^12 kilometers. How many kilometers are there in 5 light years? Express your answer in scientific notation.

• 9.46 x 10^12

• 2.5 x 10^13

• 1.0 x 10^14

• 4.73 x 10^13

A smartphone has a storage capacity of 1.28 x 10^9 bytes. If a user downloads 25 apps, each averaging 2.5 x 10^6 bytes, how much storage will be used in total? Express your answer in scientific notation.

• 6.25 x 10^7 bytes

• 5.0 x 10^7 bytes

• 1.0 x 10^8 bytes

• 7.5 x 10^7 bytes