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In the US, there are 9 zeros in a billion and 12 in a trillion.

In some parts of Europe and in Latin America, there are 12 zeros in a billion and 18 in a trillion. This scale was used in the UK until 1974, but rarely since.

Short Scale and Long Scale

The "short scale" used in the US and elsewhere assigns number names (thousand, million, billion, trillion, quadrillion) by thousands.

On the short scale, there are 12 zeros in a trillion (1012). It is 1,000,000,000,000.

The traditional long scale, used in many non-English areas of the world, advances number names by millions, with intermediate names for the thousands (milliard, billiard, trilliard). On the long scale, a billion is a million million, and a trillion is a million billion.

On the long scale, there are 18 zeros in a trillion (1018). It is 1,000,000,000,000,000,000.

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Q: How many zeros in 1 billion and how many zeros in 1 trillion?
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