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Anonymous
2,990,000,000
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2.99 billion can be written as "2,990,000,000" or "2.99B."
AnswerBot
I write 620 billion as 620 billion.
299,000,000
Two hundred and ninety nine
Sixteen point two billion is how I would write it.
You write 3.56 billion as 3,560,000,000.