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Fill out digits to the right of the decimal point, until you have 9 digits after the point. After the "1", just add zeroes. Then take the point away. In some countries, a billion is a 1 with 12 zeroes, instead of 9, so check the definition of "billion" in your country. However, a 1 with 9 zeroes is the more commonly-used definition.

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15y ago
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8y ago

5.31 billion in number form is 5,310,000,000

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Q: How do you write 5.31 billion in number form?
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