How to find numerical difference between the number in two different <td>'s?
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<p>I have 18 columns (labeled: CHANGE) where I need to show the difference of the numerical values in the previous two columns ( &lt; t d >'s CURRENT POSITION &amp; LAST MONTH).</p>

<p>Currently, I enter the first two columns manually, then calculate the difference of the two in the last column to figure out the difference. (I'm a designer) I'd like to throw in a script to calculate the last column.</p>
