#### Answer

a) There are $10^{6}$ square meters in 1 square kilometer.
b) There are $10^{6}$ cubic centimeters in 1 cubic meter.
c) There are 2589988.11 square meters in 1 square mile

#### Work Step by Step

a) From $km^{2}$ to $m^{2}$ is 3 units smaller. So one has to multiply the number in $km^{2}$ with $10^{6}$ to convert it into $m^{2}$. (Note: do not multiply it with 1000, since it is a unit of area).
So 1 $km^{2}$ is $10^{6}$ $m^{2}$. In other words, there are $10^{6}$ square meters in 1 square kilometer.
b) From $m^{3}$ to $cm^{3}$ is 2 units smaller. So one has to multiply the number in $m^{3}$ with $10^{6}$ to convert it into $cm^{3}$. (Note: do not multiply it with 100, since it is a unit of volume).
So 1 $m^{3}$ = $10^{6}$$cm^{3}$. In other words, there are $10^{6}$ cubic centimeters in 1 cubic meter.
c) 1 mi = 5280 ft
So 1 $mi^{2}$ = $5280^{2}$ $ft^{2}$ = 27878400 $ft^{2}$
1 ft = 0.3048 m
So 1 $ft^{2}$ = $0.3048^{2}$ $m^{2}$ = 0.09290304 $m^{2}$
So 1 $mi^{2}$ = 27878400 * 0.09290304 $m^{2}$ = 2589988.11 $m^{2}$. In other words, there are 2589988.11 square meters in 1 square mile.