Mastering Scientific Notation: Division & More for Grade 7

A scientist measures the mass of a small particle as 3.5 x 10^-9 grams. If she has 7.0 x 10^-3 grams of the same particle, how many particles does she have?

• 5000000

• 2000000

• 100000

• 1500000

A car travels 1.2 x 10^5 meters in a race. If the race is 3.0 x 10^2 meters long, how many laps does the car complete?

• 250

• 400

• 500

• 300

The distance from Earth to a star is approximately 4.5 x 10^16 meters. If a spaceship travels at a speed of 1.5 x 10^8 meters per hour, how long will it take to reach the star in hours?

• 2 x 10^8 hours

• 3 x 10^8 hours

• 1 x 10^9 hours

• 5 x 10^8 hours

A factory produces 2.5 x 10^4 toys in a day. If the factory operates for 3.0 x 10^2 days, how many toys does it produce in total?

• 1.0 x 10^7

• 5.0 x 10^6

• 2.5 x 10^6

• 7.5 x 10^6

A researcher has 6.0 x 10^5 bacteria in a culture. If she divides the culture into 4 equal parts, how many bacteria are in each part?

• 2.0 x 10^5

• 3.0 x 10^5

• 4.5 x 10^5

• 1.5 x 10^5

A book contains 1.2 x 10^3 pages. If a reader reads 3.0 x 10^2 pages in a week, how many weeks will it take to finish the book?

• 4 weeks

• 5 weeks

• 6 weeks

• 3 weeks

A smartphone has a battery capacity of 2.5 x 10^3 milliamp hours (mAh). If it uses 5.0 x 10^2 mAh per day, how many days can the smartphone last on a full charge?

• 3 days

• 7 days

• 5 days

• 10 days

A satellite orbits Earth at an altitude of 3.6 x 10^7 meters. If it needs to lower its orbit by 1.2 x 10^6 meters, what will be its new altitude?

• 3.5 x 10^7 meters

• 3.588 x 10^7 meters

• 3.7 x 10^7 meters

• 3.6 x 10^7 meters

A farmer harvests 4.0 x 10^3 apples from a tree. If he sells them in bags of 2.0 x 10^2 apples, how many bags does he sell?

• 20

• 30

• 10

• 50

A computer processes data at a rate of 5.0 x 10^6 bytes per second. How many bytes can it process in 2.0 x 10^3 seconds?

• 1.0 x 10^10 bytes

• 1.5 x 10^10 bytes

• 2.5 x 10^10 bytes

• 5.0 x 10^9 bytes