1.5 billion or 1,500,000,000
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1.billion
Ways to write one billion is: one billion,1 billion,1,000,000,000,you can write it in roman numeral several different ways,with tally marks, etc.
half of 1 billion is five hundred million. 1 billion halfs would be five hundred million. n / 2 = 1 billion, n = 2 billion
It is one to ten billion.
1/2