Sum means to add. 12.56 + 45.89 = 58.45 is the answer
12.56 + 45.89 = (12+45) + (0.56+0.89) = (57) + (1.45) = 58.45
The sum of 12.56 and 45.89 is 58.45. The numbers were added by aligning them by their decimal points and performing step-by-step addition. This resulted in a final answer of 58.45.
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