## Highlight opposite numbers

Pamela asks:

Ex. 1 with -1, 5000 with -5000, 75 with -75, etc.

Once I find those pairs, WITHOUT REPEATING

Ex. 75,-75,75, just the first TWO should get marked, and leave the last 75 alone.

Conditional formatting formula applied to cell range B3:B17:

### Explaining CF formula in cell B3

COUNTIF($B$3:B3, B3)=1

The first COUNTIF function counts how many values there are in the first argument that match the second argument.

It returns TRUE if it is equal to 1, meaning this is the first instance of the value. In other words, this makes sure that duplicates are not highlighted.

The first argument is also a growing cell reference, the picture below shows what it returns in column D:

COUNTIF($B$3:B3, B3*-1)

The second COUNTIF function counts how many values there are in the first argument matching B3 but with a different sign, starting from the top.

This verifies that there is a number with a different sign above the current value.

The first argument has a growing cell reference meaning it expands as you copy the formula to cells below. In this case, I am using it as a Conditional Formatting formula, however, it behaves the same.

The picture below shows what it returns in column C:

MATCH(B3*-1,$B$3:$B$17,0)

The MATCH function looks for the number but with a different sign, this verifies it really exists a pair in the first place.

The MATCH function returns a #N/A error if a number is not found

COUNT(MATCH(B3*-1,$B$3:$B$17,0))

The COUNT function then converts error to a 0 (zero). The picture below shows what it returns in column E:

Then the formula adds the numbers in the two last arrays, like this COUNTIF($B$3:B3, B3*-1)+COUNT(MATCH(B3*-1, $B$3:$B$17, 0)

and lastly multiplies with COUNTIF($B$3:B3, B3)=1.

### Download Excel *.xlsx file

Highlight overlapping date ranges using conditional formatting

The image above demonstrates a conditional formatting formula that colors a record if there is at least one record that […]

Highlight records based on overlapping date ranges and a condition

adam asks: Hi, I have a situation where I want to count if this value is duplicate and if it […]

Highlight dates in a date range

Question: How do I highlight dates that meet criteria using conditional formatting? Table of contents Highlight values in a column […]

This post demonstrates how to highlight records with the closest value to a criterion, you can also choose to highlight […]

This blog post shows you how to easily identify duplicate rows or records in a list. Conditional formatting formula: =COUNTIFS($B$3:$B$15, […]

### Leave a Reply

### How to comment

**How to add a formula to your comment**

<code>Insert your formula here.</code>

**Convert less than and larger than signs**

Use html character entities instead of less than and larger than signs.

< becomes < and > becomes >

**How to add VBA code to your comment**

[vb 1="vbnet" language=","]

Put your VBA code here.

[/vb]

**How to add a picture to your comment:**

Upload picture to postimage.org or imgur

Paste image link to your comment.

**Contact Oscar**

You can contact me through this contact form