You would right 1.2 billion like this: 1,200,000,000
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its not a number,but 12 is a billion
If the question is about WRITING 12 billion, the answer is 12 000 000 000
a billion and 1
36 billion.
380 quadrillion. --------------------------------------- 1 billion = 10 to power 12 (according to SI units) 12 billion = 12 x 10 to power 12 1 year = 86400 x 365 = 31536000 seconds 12 billion = 12 to power 12 x 31536000 = 3.78432 E20 or 378.432 trillion