You should use your calculator for such simple sums. It is far quicker and involves fewer key depressions than posting the question on WA. I could tell you that the answer is 15 but how can you be sure that I did not make a mistake? Or that I am not messing about?
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0.5
'Sum' is pretty much a synonym for add, and 5+5 or 5 plus 5 is 10.
10 and 5 10+5=15 10-5=5
They are 10 and 5