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When the sum of any individual column is 10 or greater.
It was one of the first mechanical calculators and performed addition and subtraction problems dealing with numbers up to 9,999,999
The result is called the sum of the two numbers. The operation of addition is commutative. This means that the addition of two numbers will give the same sum regardless of the order in which the numbers are added.
addition
The set of even numbers is closed under addition, the set of odd numbers is not.