90,000,000,000.00. 1 billion has nine zeros in it, so you can either add nine zeros to 90 or you can move the decimal point nine places to the right. Both methods will give you 90,000,000,000.
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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.
90% of 6 billion= 90% * 6= 0.9 * 6= 5.4 billion (5,400,000,000)
I write 620 billion as 620 billion.
Sixteen point two billion is how I would write it.
You write 3.56 billion as 3,560,000,000.