Powers of ten and scientific notation

Answer Key - Grade 7 Math Worksheet

Circle the best answer, or write your answer on the line.

1. 1.

   The big city library has 10^6 books, and Luz is working through the mystery shelf. How many books are in the library?

   1000000
2. 2.

   A tree-planting project plants 10^7 trees, and Milo planted the very first one. How many trees is that?

   10000000
3. 3.

   Pia eats 10^-1 of a pizza, which is one slice out of ten. The crust goes first. What decimal part of the pizza is that?

   0.1
4. 4.

   A grain of pollen is about 10^-5 m across, and Ren needs a microscope to see it. How many meters is that, written as a decimal?

   0.00001
5. 5.

   Bo rides a bike 8.4 × 10^2 m to school, with a bell the whole way. How many meters is that?

   840
6. 6.

   A raindrop is about 4.5 × 10^-3 m wide, and Esme caught one on a mitten. How many meters is that, written as a decimal?

   0.0045
7. 7.

   A shell from the beach is about 2.5 × 10^-2 m long, and Jun keeps it in a pocket. How many meters is that, written as a decimal?

   0.025
8. 8.

   Pia writes three town populations on paper. Which population is the greatest?

   • 2 × 10^5
   • 6 × 10^3
   • 9 × 10^4
9. 9.

   Zee writes three measurements in meters on paper. Which measurement is the least?

   • 2 × 10^-3
   • 5 × 10^-2
   • 7 × 10^-4
10. 10.

    Ari's science book lists three lengths in meters. Which length is the least?

    • 6 × 10^-2
    • 2 × 10^-4
    • 8 × 10^-5