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A 'dozen' means 12, and a 'baker's dozen' means 13.

A 'dozen' means 12, and a 'baker's dozen' means 13.

Long ago, bakers added an extra loaf to every dozen so they wouldn't get in trouble for accidentally selling bread that was a bit too small or light. Thirteen-for-twelve became known as a baker's dozen.

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More facts about Numbers

The Romans had no symbol for zero. The Romans had no symbol for zero. A 'googol' is a 1 followed by one hundred zeros. A 'googol' is a 1 followed by one hundred zeros. A “googol” is the number 1 followed by 100 zeros. A “googol” is the number 1 followed by 100 zeros. Numbers help us tell how many things there are. Numbers help us tell how many things there are. Zero is the only number that can't be written with Roman numerals. Zero is the only number that can't be written with Roman numerals.