7 billion is written as 7,000,000,000. There are nine zeros in one billion, so you can either add nine zeros to 7 or move the decimal point over to the right nine places to find your answer. Both methods will give you the same answer of 7,000,000,000.
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you can write seven billion either worded or as numbers here are some examples: seven billion or 7,000,000,000
Seven point two billion is 7,200,000,000
7,000,000,000
to write seven billion in roman numerals you have to put 7000000000
17.9 billion written out in numbers is 17,900,000,000