1.5×10^11m*10^-3=1.5×10^8 km

SI is another name for metric units

1.5×10^11 m is the same as 5×10^10km

To get this do

1.5 x 10^ 11 divide by 1000 or 10^3

To divide powers do:

a^n / a^m = a^(n-m) so 1.5 x 10^11 / 10^3 = 1.5 x 10 ^ (11 -3) = 1.5 x 10 ^ 8 km

So the SI notation for 10^8 is…. not there.

There is however 10^9 or 10^6 in SI notation. (Use the above procedure to divide by the right numbers). http://en.wikipedia.org/wiki/SI_prefix

10^6 is would give you 150 mega-kilometers (e.g. 1.5×10^8 / 10^6 = 1.5 x 10^2 etc….)

10^9 would give you 0.15 giga-kilometers

They are both the same distance just different SI prefixes.

I think that is what you mean by SI prefix if not post again and I’ll take a look.

If you need more help drop us an e-mail.

richard is the first bit. firebadger.net is the domain so first bit @ domain = my e-mail 😀 Damn spammers.