To write 0.5 billion, you would start with the number 0.5, which represents half of a whole. Then, you would multiply this by a billion, which is 1 followed by nine zeros. Therefore, 0.5 billion is written as 500,000,000.
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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