9 zeros are in 1,000,000,000/ a billion.
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There are 9 zeros in 75 billion in the US and current UK short scale. This is 75,000,000,000. There are 12 zeros in 75 billion in the older UK long scale. This is 75,000,000,000,000.
In the short scale, 7.
1000000000
One billion is 1x109 (1000000000) in the short scale such as used in the US, and 1x1012 (1000000000000) in the long scale such as used in the UK.
In 90 billion, there are 9 zeros. This is because a billion has 9 zeros (1,000,000,000), and when you multiply 90 by a billion, you get 90 billion, which retains the 9 zeros from the billion.