The sum of the digits in 252 is 2 + 5 + 2 which equals 9.
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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.
1 + 1 = 2 The sum of the digits is therefore 2.
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A dozen is equal to 12. The sum of the digits of 12 are 1 + 2 = 3.