To write out 4.4 billion, you would start with the number 4, followed by the word "billion." In numerical form, it is written as 4,400,000,000. This is because each billion consists of 1,000 million, so 4.4 billion is equivalent to 4,400 million.
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u write four billion like 4,0000,000,000
30,000,000,000 thirty billion
44/n
Six billion = 6,000,000,000
15.8 billion = 15,800,000,000