Scientific notation calculation

What is 4.60x10^-14 / 9.11x10^-31 =

= [ 4.60x10 ^-14 / 9.11 ] x 10 ^-31

=5.049 * 10 ^-46 (correct to 4 significant figures)

The real meaning of this type of question is often ambiguous. You really do need to use bracket.