1) The size of the Indian Ocean is 2.7 x 10^7 square miles. The Arctic Ocean is 1/5 the size of the Indian Ocean. How big is the Arctic Ocean?
$${\mathtt{2.7\times 10^{7}}}{\mathtt{\,\times\,}}\left({\frac{{\mathtt{1}}}{{\mathtt{5}}}}\right) = {\mathtt{5\,400\,000}}$$