1.1 billion is written as 1,100,000,000. Because 1 billion has nine zeros in it, you can simply move the decimal point nine places to the right to get your answer of 1,100,000,000.
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17.9 billion written out in numbers is 17,900,000,000
1,000 billion billion is: 1,000,000,000,000,000,000,000
153.4 billion = 153,400,000,000
4.2 billion = 4,200,000,000
It is: 900,000,000 = 0.9 billion