one good things of excel are we can calculate a whole lot of massive data, manage and manipulate it in no time. no matter with average, sum, even standard deviation can be calculated in very short time. of course we do that by inserting the formula, and as long as we know how to do it properly and there should be no problem in managing our data, because microsoft excel will calculate it and sort it all for us, however if you insert the wrond command for the formula or wrong method of inserting data, then you should have a hard time with microsoft excel.

this are list of common problem that commonly faced by students:

– forget to put the “=” in the begining of the formula, not so fatal, but a waste of time.

– having trouble of using the formula system efficiently.

and many more, but here are the basic tips for you to understand more about excel and do better. the principal is basically the same, you just need to understand how the excel mechanism work and all of your problem should be solved.

let’s try with the simplest function of the excel formula, SUM.

**Using the SUM Function**

The SUM function in Excel is specifically designed to add values from different ranges. The **SUM** Function can be typed into a cell in Excel, or inserted via the **Insert Function** tool to the left of your Formula bar. The syntax of the **SUM** Function is SUM(number1,number2, …). **SUM** is the function name, and contained within the brackets are “arguments”, or the pieces of information that Excel requires to complete the Function. The **SUM** function allows from 1 to 30 arguments (number 1, number ….) for which you require the total value or **SUM**.

**Using Ctrl to Mark Cells**

If you wish to add cells that are non-contiguous (not joined together), type in your function **=SUM(** click in the first cell you wish to add. Hold down your **Ctrl** key and click in all other cells you wish to add up, then type in a **)**. Typing in a comma instead of selecting with your **Ctrl** key also works just as efficiently as well.

**Using SUM to Add a Range from a Different Worksheet**

You can easily use **SUM** to add up the same range in different worksheets. Click in the cell you want the result of your addition in, then holding down the **Shift** key, click on the next worksheet that you wish to include in your calculation and highlight the range to be used, then click **Enter**.

One thing to note here however, is that if you insert a worksheet in the middle of the range that you have told the **SUM** function to add, then the same range on that worksheet will be included in your sum.

**TIP!** If you wish to force any new inserted worksheets to be included in the **SUM** range, try this. insert a blank worksheet at the beginning of your sheets in your workbook, and a blank sheet at the end. Now in the cell that you wish the result of your addition to appear in type in =SUM( and then click on the *new first blank worksheet* and highlight the range you require to be added in all worksheets. Hold down your **Shift** key and click on the *new last blank worksheet*, then close your bracket ) and hit enter. Now hide the first sheet and the last sheet by going to Format>Sheet>Hide. This will force any new worksheets to be included in the **SUM** range as all new worksheets will be between the 2 blank ones.

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