How many zeros are in 9 billion?

Answer 1

There are competing scales that confusingly use the same number names.

Short Scale

In the US, UK, and other English-speaking countries, a billion has 9 zeroes (1 x 109).

9 billion is then 9,000,000,000.

Long Scale

In most of Europe and in Latin America, a billion has 12 zeroes, because number names are assigned by millions, not by thousands, so a billion is a million million (1 x 1012).

9 billion there would be 9,000,000,000,000.