Yes because if the number that goes in the ones is in the tens,the sum wouldn't make scence.
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They are called the digital roots.
The sum of the first 8 odd numbers is 64.
If the first number is 100 then the second number is 50 and the sum is 150. If the second number is 100 then the first number is 200 and the sum is 300. The question cannot be answered with one solution as it is currently worded.
The sum of the 1st perfect number and 2nd perfect number is. . . 34!
The sum of the first 57 natural numbers is 1,625.