The answer depends on whether you're using the U.S. or British billion.
The U.S. billion is a thousand millions, so 25 billion is 25,000 millions.
The British billion is a million millions, so 25 billion is 25,000,000 millions.
The answer depends upon where you are:
→ 25 billion = 25,000,000 million (25 million million)
→ 25 billion = 25,000 million (25 thousand million).
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25,000 million. Therefore, 1 billion = 1000 million, 2 billion = 2000 million, 3 billion = 3000 million. Get the idea? So, what would 100 billion be in millions?
There are 1,600 millions in 1.6 billion.
There are 5,050 millions in 5.05 billion.
In general terms, 1 billion is equal to 1000 millions
A thousand millions = a billion in Australia.