Microsoft Excel 2003 may report errors in a spreadsheet if a calculation involves a value expected to be a number, but isn't. To help prevent this from happening, use the **=isnumber** function:

**=isnumber(VALUE)**

*VALUE* is a value, cell, or function result

This function is useful when combined with other functions. For example, assuming the following spreadsheet of quarterly profits (in thousands):

A B

1 1st Quarter (in $k) $256.00

2 2nd Quarter (in $k) $113.00

3 3rd Quarter (in $k) John

4 4th Quarter (in $k) $456.00

5

6 =IF(ISNUMBER(B1),"","1st Quarter Value is Invalid")

7 =IF(ISNUMBER(B2),"","2nd Quarter Value is Invalid")

8 =IF(ISNUMBER(C1),"","3rd Quarter Value is Invalid")

9 =IF(ISNUMBER(B4),"","4th Quarter Value is Invalid")

As you can see, the value for the 3rd quarter is invalid. In fact, cell

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