The Sum Function

The Sum Function
You saw a simple way to add up in the previous section. Enter an equals sign, followed by the cells you want Excel to add up:
= B4 + B5 + B6 + B7
But this is not a good way to add up in Excel: it could get very tedious indeed if you had to type out say 50 cell references by hand. The easy way is to get Excel to do the work for you. That's where SUM comes in.
The Excel SUM function
The SUM function is used to add things up, and saves you the bother of typing out lots of cell names and numbers. It looks like this:

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