Are you a little bit dyslexic dee? 11 x 15 = 165
so the first 3 digits are 165 not 156
Now Scott,
your question is ambiguous.
In Australia and the UK I think, a billion is a milion million, that is 1,000,000,000,000 or 10 12
but in the US a billion is a thousand million, that is 1,000,000,000 which is 10 9