A dozen is equal to 12. The sum of the digits of 12 are 1 + 2 = 3.
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Since a dozen is 12, then the digits are 1 and 2. To get the sum, you simply add 1 + 2, which = 3.
When the sum of the digits you are adding is 10 or larger.
The sum of the digits is also a multiple of 9. And, if the sum of the digits is too large, you can sum those digits and keep going.
Add the digits together. The sum of the digits of 23 is 5.
There are several hundred of them. One example, the smallest, is 1039