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1) The meter to km conversion = 10³, therefore:

m² to km² = 10⁶

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 10⁴ m² = 4.62 x 10¯² km²

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

2) The fm to cm conversion = 10¹³, therefore:

fm² to cm² = 10²⁶

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 10¹⁰ fm² x (1 cm² / 10²⁶ fm²) = 3.20 x 10¯¹⁶ cm²

3) no answer provided