8th Grade Scientific Notation: Adding & Dividing Challenges

A scientist measures the mass of a small particle as 3.5 x 10^-9 kg. If she has 5.0 x 10^3 particles, what is the total mass of all the particles in kg?

• 3.5 x 10^-6 kg

• 1.0 x 10^-4 kg

• 5.0 x 10^-3 kg

• 1.75 x 10^-5 kg

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A car travels a distance of 2.4 x 10^5 meters in 1.2 x 10^2 seconds. What is the average speed of the car in meters per second?

• 2500.0 m/s

• 1500.0 m/s

• 2000.0 m/s

• 3000.0 m/s

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CCSS.8.EE.A.4

The population of a small town is approximately 1.2 x 10^4 people. If the population increases by 3.5 x 10^3 people, what is the new population in scientific notation?

• 1.0 x 10^4

• 1.8 x 10^4

• 1.2 x 10^4

• 1.55 x 10^4

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CCSS.8.EE.A.4

A researcher is studying bacteria that reproduce every 2 hours. If the initial population is 1.0 x 10^2 bacteria, how many bacteria will there be after 6 hours?

• 2.0 x 10^2

• 4.0 x 10^2

• 16.0 x 10^2

• 8.0 x 10^2

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A satellite is orbiting Earth at an altitude of 4.0 x 10^7 meters. If it needs to descend to an altitude of 1.0 x 10^6 meters, how much lower does it need to go in meters?

• 1.0 x 10^6 meters

• 5.0 x 10^7 meters

• 2.0 x 10^7 meters

• 3.9 x 10^7 meters

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A factory produces 2.5 x 10^4 widgets per day. How many widgets does the factory produce in 30 days?

• 5.0 x 10^5

• 2.5 x 10^5

• 7.5 x 10^5

• 1.0 x 10^6

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A comet travels at a speed of 2.0 x 10^4 km/h. How far does it travel in 3.0 x 10^2 hours?

• 1.2 x 10^7 km

• 8.0 x 10^5 km

• 6.0 x 10^6 km

• 4.5 x 10^6 km

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The weight of a book is 1.5 x 10^1 kg. If a library has 2.0 x 10^3 books, what is the total weight of the books in kg?

• 3.0 x 10^4 kg

• 4.0 x 10^4 kg

• 1.0 x 10^3 kg

• 2.5 x 10^4 kg

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A cell phone company sells 3.0 x 10^5 units in one month. If they plan to increase sales by 2.0 x 10^4 units next month, what will be the total sales in scientific notation?

• 3.0 x 10^5

• 3.2 x 10^5

• 3.5 x 10^5

• 2.0 x 10^5

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A biologist is studying a species of fish that can grow to 5.0 x 10^2 grams. If she has 4.0 x 10^3 fish, what is the total weight of the fish in grams?

• 2.0 x 10^6 grams

• 1.0 x 10^6 grams

• 3.0 x 10^5 grams

• 5.0 x 10^4 grams

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CCSS.8.EE.A.4