**Square Answers**

1) The meter to km conversion = 10^{3}, therefore:

m^{2} to km^{2} = 10^{6}

Since the conversion goes small unit (meter) to larger unit (km), we must make the sign on the exponent be negative, hence 10¯^{6}.

This means 4.26 x 10^{4} m^{2} = 4.62 x 10¯^{2} km^{2}

This creation of the negative can be seen in the following set-up which uses techniques explained previously:

2) The fm to cm conversion = 10^{13}, therefore:

fm^{2} to cm^{2} = 10^{26}

Since the conversion goes small unit (femtometer) to larger unit (centimeter), we must make the sign on the exponent be negative, hence 10¯^{26}.

Therefore:

3.20 x 10^{10} fm^{2} x (1 cm^{2} / 10^{26} fm^{2}) = 3.20 x 10¯^{16} cm^{2}

3) no answer provided