Practice Test 11

A video game has about $9\times10^6$ active players. Another game has about $3\times10^7$ active players. About how many times as many players does the second game have as the first?

A typical cell is about $1\times10^{-5}$ meters across, and an atom is about $1\times10^{-10}$ meters across. About how many times larger is the cell than the atom?