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Highlight integers only

Excel formula: Highlight integers only
Generic formula 
=MOD(A1,1)=0
Summary 

To highlight numbers that are integers, you can use a simple formula based on the MOD function. In the example shown, conditional formatting has been applied to the range B4:G11 using this formula:

=MOD(B4,1)=0

Note: it's important that CF formulas be entered relative to the "active cell" in the selection, which is assumed to be B4 in this case.

Once you save the rule, you'll see only values that are integers (whole numbers) highlighted.

Explanation 

The MOD function returns the remainder after division. With a divisor of 1, MOD will return zero for any whole number.

We use this fact to construct a simple formula that tests the result of MOD. When the result is zero (i.e. when the number is an integer) the formula returns TRUE, triggering the conditional formatting.

When the result is not zero (i.e. the number has a decimal component, and dividing by 1 leaves remainder) the formula returns FALSE.

Author 
Dave Bruns
Related formulas 
Excel formula: Highlight unique values
Highlight unique values
COUNTIF simply counts the number of times each value appears in the data range. By definition, each value must appear at least once, so when the count equals 1, the value is unique. When the count is 1, the formula returns TRUE and triggers the rule...
Related functions 
Excel MOD function
Excel MOD Function

The Excel MOD function returns the remainder of two numbers after division.  For example, MOD(10,3) = 1. The result of MOD carries the same sign as the divisor.

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See also 
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Test conditional formatting with dummy formulas
Cool things you can do with conditional formatting

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