One billion is expressed as a 1 followed by nine zeros:
1,000,000,000
1.2 billion then would be expressed a a one, followed by a 2, and then followed by eight zeros:
1,200,000,000
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9
1,000,000,000,000 12
In English speaking countries there are 9 zeros in four billion. 4,000,000,000 In other countries there may be 12 zeros in four billion. 4,000,000,000,000
In English speaking countries there are 9 zeros in five billion. 5,000,000,000 In other countries there may be 12 zeros in five billion. 5,000,000,000,000
In English speaking countries there are 9 zeros in seven billion. 7,000,000,000 In other countries there may be 12 zeros in seven billion. 7,000,000,000,000