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There are two ways, both are used : "one point five billion" and "one and a half billion".

Another form for decimals (one and five-tenths) is seldom used for large numbers.

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1,160,000,000 is one billion, one hundred and sixty million.

It is one billion one hundred sixty million.

One billion, one hundred sixty million

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one billion sixty million

Q: How do you spell out 1.5 billion in words?

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One hundred fifty-five billion.

15 billion

Fifteen.

Fifteen dollars.

Ten billion

15

15 billion is correct unless there is some reason to capitalize the word billion, perhaps in a title.

Those letters spell billion.

one thousand million=15 billion 1 billion/ 15 billion = 1/15= 0.0666

15

Seventy billion

Eight billion, eighty-six million, nine hundred eight thousand, three hundred twelve.