Mastering Multiplication & Division in Scientific Notation

A scientist measures the mass of a small particle as 3.2 x 10^-27 kg. If she has 5 such particles, what is the total mass in scientific notation?

• 1.0 x 10^-25 kg

• 6.4 x 10^-27 kg

• 3.2 x 10^-26 kg

• 1.6 x 10^-26 kg

Tags

CCSS.8.EE.A.4

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.

• 1.5 x 10^4

• 5.0 x 10^3

• 1.0 x 10^4

• 2.5 x 10^4

Tags

CCSS.8.EE.A.4

A comet is traveling at a speed of 1.5 x 10^4 km/h. If it travels for 3 hours, how far will it have traveled in scientific notation?

• 1.2 x 10^5 km

• 4.5 x 10^4 km

• 3.0 x 10^4 km

• 6.0 x 10^4 km

Tags

CCSS.8.EE.A.4

A cell has a volume of 1.2 x 10^-9 liters. If you have 10 cells, what is the total volume in scientific notation?

• 1.2 x 10^-6 liters

• 1.2 x 10^-8 liters

• 1.2 x 10^-9 liters

• 1.2 x 10^-7 liters

Tags

CCSS.8.EE.A.4

A factory produces 4.5 x 10^6 widgets in a month. If the factory operates for 12 months, how many widgets does it produce in a year in scientific notation?

• 6.0 x 10^7

• 5.4 x 10^7

• 4.5 x 10^7

• 5.4 x 10^6

Tags

CCSS.8.EE.A.4

A small planet has a diameter of 7.8 x 10^6 meters. If you divide this diameter by 2 to find the radius, what is the radius in scientific notation?

• 3.9 x 10^6

• 4.5 x 10^6

• 3.0 x 10^6

• 2.5 x 10^6

Tags

CCSS.8.EE.A.4

A computer processes 3.0 x 10^8 calculations per second. How many calculations does it process in 5 seconds? Express your answer in scientific notation.

• 1.5 x 10^9

• 3.0 x 10^10

• 1.0 x 10^8

• 2.0 x 10^9

Tags

CCSS.8.EE.A.4

A water reservoir holds 2.5 x 10^9 liters of water. If 1.0 x 10^8 liters are used, how much water remains in scientific notation?

• 2.5 x 10^9 liters

• 1.0 x 10^9 liters

• 2.0 x 10^9 liters

• 2.4 x 10^9 liters

Tags

CCSS.8.EE.A.4

A light year is approximately 9.46 x 10^12 kilometers. If a star is 4 light years away, how far is it from Earth in scientific notation?

• 2.5 x 10^13 kilometers

• 3.784 x 10^13 kilometers

• 1.0 x 10^12 kilometers

• 5.2 x 10^14 kilometers

Tags

CCSS.8.EE.A.4

A small electronic device uses 1.2 x 10^-3 kilowatts per hour. If it runs for 24 hours, how much energy does it consume in scientific notation?

• 3.24 x 10^-2 kWh

• 2.88 x 10^-2 kWh

• 1.44 x 10^-2 kWh

• 1.20 x 10^-2 kWh

Tags

CCSS.8.EE.A.4