It depends on whether you are English or American. The traditional English billion is a million-million, while the traditional American billion is a thousand-million.
Thus
English Billion is 1,000,000,000,000
American Billion is 1,000,000,0009
In 1965 a billion was officially defined in the UK (not English) parliament as a thousand million. That was more than 50 years ago so the answer give by "df df" is hopelessly out-of-date! And that ignores the extraneous 9 in his definition of an American billion.
Furthermore, his answer ignores the fact that the question asked about "one billion pounds" - not just "one billion". If it is a billion pounds in mass, the numerical value should be followed by "lbs". If it refers to the UK currency, is should be preceded by GBP. If if refers to a pound currency for some other country, then there are other 3-character codes which identify the currency according to ISO 4217: for example EGP for Egypt, LBP for Lebanon, SDG for Sudan.
1,500,000,000,000 or one trillion, five hundred billion.
One billion.
One trillion, one hundred billion.
One billion, four hundred ninety-three million or 1.493 billion.
144,000,000,000 is one hundred and forty-four billion
1,000,000,000
1,000,000,000
500,000,000
1,000,000,000
150 pounds.
In figures 130,000,000,000 In words 'One hundred and thirty billion'.
1,600,000 pounds
£ 1,000,050
1,000,750,000
1,079,000 pounds.
1,005,000
£1,400.00