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Daniel Math Academy · Grade 8 Math

Scientific Notation Word Problems

Skill B.4 · Operations with scientific notation · ★★☆ Medium · Quarter 1

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Write each answer in scientific notation.

1. 1
   Light travels about $2.3\times 10^{11}$ kilometers in a year. How many kilometers does it travel in $6.2\times 10^3$ years?
2. 2
   A grain of sand has a mass of about $9\times 10^{-4}$ gram. What is the mass of $2\times 10^5$ grains?
3. 3
   A country has about $4.8\times 10^{12}$ people. A city has about $8\times 10^5$ people. How many times as many people live in the country?
4. 4
   A planet is $7\times 10^9$ kilometers from its star. A spacecraft travels $1\times 10^5$ kilometers per day. How many days does the trip take?

Daniel Math Academy · Grade 8 Math

Answer Key

B.4 Scientific Notation Word Problems · ★★☆ Medium

1. 1$1.426\times 10^{15}$
2. 2$1.8\times 10^2$
3. 3$6\times 10^6$
4. 4$7\times 10^4$