What is the word you use to work out a sum?

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Strictly speaking, it is ADD. The word 'sum' is used colloquially for any simple arithmetical calculation, but in mathematics a 'sum' is properly the result of adding two or more numbers.
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How do you work out the sum of the exterior angles?

exterior angles always add up to 360 degrees, but 'exterior angle' refers to the angle that is made when you continue one of the lines. eg a square has 4 sides, make one of th