12 is a dozen
13 is a Baker's Dozen
20 is a score
144 is a gross.
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A dozen
A dozen is twelve, so twelve dozen equals twelve times twelve.
A gross is a dozen dozen. A dozen is twelve. So multiply twelve by twelve to get a gross, then multiply the gross by twelve again.
A dozen dozen is twelve dozen or twelve twelves or 144. This is also known as a gross.
A group of twelve things is called a dozen.