How much would it be if you divided 900.000.000.000 by 300000000?

First all the full stop /period is only used to separate units from decimals.

To separate very large number into thousands a COMMA(,) is used.

So the first number should read 900,000,000,000 and the second number should read 300,000,000

So creating a fraction

900,000,000,000 / 300,000,000

Cancel down by 1 million ( 1,,000,000)

Hence

900,000/ 300

Cancel down by '100'

Hence

9,000 / 3

Cancel; down by '3'

1,000 The answer !!!!!