Mastering Subtraction in Scientific Notation for 6th Grade

A scientist measures the mass of a small particle as 3.5 x 10^-27 kg. Another particle has a mass of 1.2 x 10^-27 kg. What is the difference in mass between the two particles in scientific notation?

• 2.3 x 10^-27 kg

• 4.7 x 10^-27 kg

• 1.5 x 10^-27 kg

• 3.0 x 10^-27 kg

A comet is traveling at a speed of 2.5 x 10^4 km/h. If it speeds up to 1.5 x 10^5 km/h, how much faster is it traveling now in scientific notation?

• 1.0 x 10^5 km/h

• 1.25 x 10^5 km/h

• 2.0 x 10^5 km/h

• 5.0 x 10^4 km/h

The distance from Earth to a star is approximately 4.2 x 10^16 meters. If a spaceship travels 1.8 x 10^15 meters towards the star, how far is it from the star now in scientific notation?

• 3.8 x 10^16

• 4.0 x 10^16

• 4.5 x 10^16

• 4.02 x 10^16

A bacterium can reproduce every 20 minutes, and after 3 hours, there are approximately 1.6 x 10^6 bacteria. If 5.0 x 10^5 bacteria die, how many bacteria are left in scientific notation?

• 1.0 x 10^5

• 1.1 x 10^6

• 1.5 x 10^6

• 1.2 x 10^6

A cell has a volume of 2.5 x 10^-9 liters. If another cell has a volume of 1.0 x 10^-9 liters, what is the difference in volume between the two cells in scientific notation?

• 3.5 x 10^-9 liters

• 1.0 x 10^-8 liters

• 2.0 x 10^-9 liters

• 1.5 x 10^-9 liters

A researcher finds that a certain chemical is present in the soil at a concentration of 3.0 x 10^-4 grams per liter. If another sample has a concentration of 1.2 x 10^-4 grams per liter, what is the difference in concentration in scientific notation?

• 1.8 x 10^-4 grams per liter

• 2.0 x 10^-4 grams per liter

• 3.5 x 10^-4 grams per liter

• 1.5 x 10^-4 grams per liter

A satellite orbits Earth at a height of 3.6 x 10^7 meters. If another satellite orbits at a height of 1.2 x 10^7 meters, how much higher is the first satellite in scientific notation?

• 2.4 x 10^7 meters

• 2.0 x 10^7 meters

• 3.0 x 10^7 meters

• 1.8 x 10^7 meters

A factory produces 2.5 x 10^3 toys in a day. If production increases to 1.5 x 10^4 toys, how many more toys does the factory produce in scientific notation?

• 1.5 x 10^4

• 2.0 x 10^3

• 1.25 x 10^4

• 1.0 x 10^4

The volume of a small lake is 1.2 x 10^6 cubic meters. If a drought reduces the volume by 3.0 x 10^5 cubic meters, what is the new volume of the lake in scientific notation?

• 6.0 x 10^5

• 3.0 x 10^5

• 9.0 x 10^5

• 1.5 x 10^6

A computer processes data at a rate of 4.0 x 10^9 bits per second. If it processes 2.5 x 10^8 bits less in a certain period, how many bits does it process in scientific notation?

• 2.5 x 10^9

• 3.75 x 10^9

• 3.0 x 10^9

• 4.5 x 10^9