who nows what 300,000,000 x 900,000,000?

Answer 1

Google knows!

http://www.google.com/#q=300%2C000%2C000+x+900%2C000%2C000+%3D+

Answer 2

Wolfram knows, too!!

http://www.wolframalpha.com/input/?i=300000000*900000000