Expressions and Equations: Performing Operations with Scientific Notation (CCSS.8.EE.4) Practice Test

A bacteria culture has $3\times 10^{5}$ cells. It doubles each hour for 3 hours. How many cells are there after 3 hours?

A space probe travels at $3\times 10^{4}$ m/s for $2\times 10^{3}$ seconds. What is the distance traveled, expressed in scientific notation?