one billion has nine zeros, so seven billion would be:
7,000,000,000
to write seven billion in roman numerals you have to put 7000000000
1,000,000,000 = 1 billion.
2000000000
1,200,000,000
18,400,000,000
As a number it is: 7,000,000,000
2.3 billion is written: 2,300,000,000
Like this ==> 1,500,000,000
8,000,000,000
30,607,016,041
The number 1 billion can be written as the Roman numeral [M] with a horizontal bar above it (which I can't write with my keyboard).
you can write seven billion either worded or as numbers here are some examples: seven billion or 7,000,000,000