0.45 billion is 450 million.
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1 billion = 1,000 million 1/2 billion = 500 million
1 billion = 1000 million so 0.1 billion = 100 million
11.18 billion = 11,180 million
2000 million is two billion.
1 billion = 1,000 million 2 billion = 2,000 million . . 7 billion = 7,000 million