Mastering Scientific Notation: Add & Convert Challenge

A scientist measures the mass of a small particle as 3.5 x 10^-27 kg. If another particle has a mass of 2.1 x 10^-27 kg, what is the total mass of both particles in scientific notation?

• 4.5 x 10^-27 kg

• 3.0 x 10^-27 kg

• 5.6 x 10^-27 kg

• 6.0 x 10^-27 kg

The distance from Earth to a nearby star is approximately 4.2 x 10^16 meters. If a spaceship travels 1.5 x 10^16 meters towards the star, how far is it from the star now in scientific notation?

• 3.5 x 10^16 meters

• 2.7 x 10^16 meters

• 1.2 x 10^16 meters

• 4.0 x 10^16 meters

A bacterium can reproduce every 20 minutes. If one bacterium starts reproducing and after 3 hours there are 1.2 x 10^6 bacteria, how many bacteria were there initially in scientific notation?

• 5.67 x 10^1

• 1.5 x 10^4

• 2.34 x 10^3

• 3.0 x 10^2

A cell phone company sold 5.6 x 10^5 units in the first quarter and 3.4 x 10^5 units in the second quarter. How many units did they sell in total in scientific notation?

• 9.0 x 10^5

• 9.5 x 10^5

• 8.0 x 10^5

• 7.0 x 10^5

The speed of light is approximately 3.0 x 10^8 meters per second. How far does light travel in 2 seconds in scientific notation?

• 7.0 x 10^8 meters

• 4.0 x 10^8 meters

• 6.0 x 10^8 meters

• 5.0 x 10^8 meters

A small electronic device uses 2.5 x 10^-3 watts of power. If you have 4 devices, what is the total power consumption in scientific notation?

• 1.0 x 10^-2

• 2.5 x 10^-3

• 5.0 x 10^-3

• 1.5 x 10^-2

A researcher found that a certain chemical is present in the environment at a concentration of 7.8 x 10^-5 grams per liter. If the researcher collects 3 liters of water, how much of the chemical is present in total in scientific notation?

• 5.67 x 10^-4 grams

• 3.12 x 10^-5 grams

• 1.56 x 10^-4 grams

• 2.34 x 10^-4 grams

The population of a small town is 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?

• 1.9 x 10^4

• 1.25 x 10^4

• 1.2 x 10^4

• 1.55 x 10^4

A comet is traveling at a speed of 2.5 x 10^4 meters per second. If it travels for 3 seconds, how far does it travel in scientific notation?

• 2.5 x 10^4 meters

• 7.5 x 10^4 meters

• 5.0 x 10^4 meters

• 1.0 x 10^5 meters

A library has 1.5 x 10^6 books. If they acquire 2.5 x 10^5 more books, how many books do they have in total in scientific notation?

• 2.0 x 10^6

• 1.5 x 10^5

• 1.25 x 10^6

• 1.75 x 10^6