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Madhu007Madhu007 

add the fields in the vf page..

Hi,

I have three number fields on the page. I will add/sum the two fields and auto populate that sum value into another field on the page.
Please help.......

Thanks.. 
SamReadySamReady
If you want to use Visualforce, you could use a combination of an <apex:outputPanel id="myPanel"> and an <apex:actionSupport reRender="myPanel"> to invoke a method in your class and synchronously update that value within the form. 

You could also use jQuery or any sort of JavaScript to handle the two text values asynchronously and populate the field that way.