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Anonymous
12,000,000,000
Wiki User
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1.2 billion is 1,200,000,000 .
Write 12, followed by 9 zeroes. Or 12 zeroes, depending where you live - but 9 zeroes is more common.
1.56*10^12
29,005,803,012
u write four billion like 4,0000,000,000
30,000,000,000 thirty billion