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 Description  
 Sum:   The number you get by adding two or more numbers together.

For example:

The sum of 23 and 56 is 79 because 23 + 56 = 79.

The sum of 5, 2, and 4 is 11 because 5 + 2 + 4 = 11.

The sum of x and y is x + y because x + y = x + y.