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Ten ones make 10, 10 10s make 100 and 10 100s make 1,000. One million contains 1,000 1,000s. One trillion is 1,000 billions or one million millions. It is written as a one followed by 12 zeros or 10^12. In Great Britain, however, one billion is written with 12 zeros and one trillion with 18 zeros.
In American usage, a billion has 9 zeroes, a trillion has 12, and the next named number, quadrillion, has 15. But in British usage, a billion has 12 zeroes, a trillion has 18, and a quadrillion has 24.