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Can you please be more specific in your request? Which Math Function are you trying to use?
Can you also provide us ID of your form so we can take a closer look?
Looking forward to your reply.
I don't know that which function should I use, But ultimately I want that in fieldA value put by the user and automatically in fieldB the value should equals to fieldA but if fieldA value is more than 10000 then fieldB Value should get limit to 10000.
form link is: https://secure.jotform.me/form/51464351014445
here in this form fieldB is "Under 80TTA" and fieldA is "Interest credited in your saving account".ndr
You can achieve that with conditional logic. First you need to change your "Interest Credited in your Saving Account" to be number field.
Then you need to set conditional logic to update a form field value.
Here is a demo form I made http://form.jotformpro.com/form/51484872078970? .
I added "test" field that is number field below your "Interest Credited in your Saving Account" field and I applied condition on that field.
You can clone my form to take a closer look to my conditions.
Hope this will help. Let us know if you need further assistance.