(8.1x10^15)x(6.3x10^3)

(8.1x10^15)x(6.3x10^3)

thanks, lae -- that was a great help ...

(8.1x10^15)x(6.3x10^3)
= 8.1*6.3 * 10^15 * 10^3
= 51.03 * 10^18
= 5.103 * 10^19