Mastering Scientific Notation: Addition Challenges for 6th Graders

A scientist measures the mass of a small particle as 3.5 x 10^-27 kg and another particle as 2.1 x 10^-26 kg. What is the total mass of both particles in scientific notation?

• 1.75 x 10^-26 kg

• 3.0 x 10^-27 kg

• 5.6 x 10^-26 kg

• 2.45 x 10^-26 kg

A cell in a petri dish contains 4.2 x 10^5 bacteria. After a few hours, it grows to 5.3 x 10^5 bacteria. How many bacteria are there in total now?

• 8.5 x 10^5

• 6.2 x 10^5

• 7.3 x 10^5

• 9.5 x 10^5

The distance from Earth to a nearby star is approximately 4.2 x 10^16 meters. If another star is 3.8 x 10^16 meters away, what is the total distance to both stars in scientific notation?

• 9.0 x 10^16 meters

• 8.0 x 10^16 meters

• 7.5 x 10^16 meters

• 8.5 x 10^16 meters

A small comet has a diameter of 1.5 x 10^-3 km, while a larger comet has a diameter of 2.3 x 10^-2 km. What is the combined diameter of both comets in scientific notation?

• 1.8 x 10^-2 km

• 2.45 x 10^-2 km

• 2.5 x 10^-2 km

• 2.0 x 10^-3 km

A factory produces 2.5 x 10^4 toys in one month and 3.1 x 10^4 toys the next month. How many toys did the factory produce in total over the two months?

• 5.0 x 10^4

• 5.6 x 10^4

• 4.5 x 10^4

• 6.1 x 10^4

A researcher finds that a certain chemical is present in 6.7 x 10^-5 grams in one sample and 2.4 x 10^-5 grams in another sample. What is the total amount of the chemical in scientific notation?

• 1.0 x 10^-5 grams

• 9.1 x 10^-5 grams

• 7.1 x 10^-5 grams

• 8.5 x 10^-5 grams

The height of a mountain is 8.9 x 10^3 meters, and the height of a hill is 2.5 x 10^3 meters. What is the combined height of the mountain and hill in scientific notation?

• 1.0 x 10^5 meters

• 9.4 x 10^3 meters

• 1.2 x 10^4 meters

• 1.14 x 10^4 meters

A computer can process 1.2 x 10^9 calculations per second. If it runs for 3 seconds, how many calculations does it process in total in scientific notation?

• 4.8 x 10^9

• 3.6 x 10^9

• 2.4 x 10^9

• 1.2 x 10^9

A library has 4.5 x 10^6 books, and it receives a donation of 2.3 x 10^6 books. How many books does the library have now in scientific notation?

• 5.5 x 10^6

• 7.3 x 10^6

• 4.0 x 10^6

• 6.8 x 10^6

A planet is 5.6 x 10^11 kilometers away from Earth, and another planet is 3.4 x 10^11 kilometers away. What is the total distance to both planets in scientific notation?

• 8.0 x 10^11 kilometers

• 9.0 x 10^11 kilometers

• 7.0 x 10^11 kilometers

• 10.0 x 10^11 kilometers