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Excel For Noobs Tutorial: Excel Formula Errors
Sometimes Excel will return a formula error when you enter a formula into a cell. Formula errors start with a hash mark (#) and signals that there is something wrong with your formula or something wrong with a cell that your formula refers to.
Sometimes an error will cause a ripple effect throughout your entire workbook with multiple cells resulting in formula errors. This happens when all of these cells are dependent on that cell that contains the formula error.
 #DIV/0! Your formula is trying to divide by 0 or is trying to divide by an empty cell.
 #NAME? You will get this error if your formula uses a name that Excel doesn’t recognize. For example table name or cell range name that does not exist in your Excel workbook.
 #N/A This error occurs when the value is not available yet. Other functions such as the VLOOKUP function can return this error.
 #NULL! You will get the #NULL! error when a function argument is not separated with a comma, if the cell ranges or cell references are not separated by formula operators or if a cell range is not separated by a colon between its start and end point (for example A1:B3).
 #NUM! There is a problem with the number. For example you would get this error if you inserted the Square Root function and referred to a cell that contained a negative number.
 #REF! You will get this error if your formula refers to a cell that is invalid. This can happen when a cell has been deleted from your workbook.
 #VALUE! This error arises when a formula refers to a cell that contains a value that cannot be calculated. For example, If while inserting the SUM formula we referred to a cell that contained qualitative data such as a name, Excel would return this error because it is impossible to calculate the sum of a name.
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