0.4 billion is four tenths of one billion. One tenth of a billion is 100 million. (A billion is one thousand millions.) So four tenths of a billion is 400 million, or 400,000,000.
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u write four billion like 4,0000,000,000
30,000,000,000 thirty billion
15.8 billion = 15,800,000,000
Six billion = 6,000,000,000
$13 billion$13,000,000,000.00