Lesson 2 – B : Excel sum function 'practical lesson' ;

Lesson  2 – B : work on table (sum )
The figure below shows us 3 salespersons and the no. Of units sold during the week
We want to know the sum of sold units per person and per day




To get the total of every salesperson we will go to cell B9 and we need to sum the sold units in cells from B3 to B8 , so it will be as we said before we have to start with equal sign :
=b3+b4+B5+b6+b7+b8
Or
=sum(b3+b4+B5+b6+b7+b8)
Or this is the new thing
If you want to sum range of cells , you can use SUM and define the first cell in the range and the last cell in the range and separate them with ‘:’ for example , we want to sum cells from b3 to b8 so it will be :
=sum(b3:b8)
after you finish click enter to get the result 
And we also will get the same result 




So we calculated the sum of first salesperson Tamer , then how can we do the same function for the other salespersons without redundancy?
The easiest way is to click and drag the function by the pointer which will appear when you put the mouse on the bottom right corner of the cell    it is look like a black cross



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