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JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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Decimals are supported with Spreadsheet Widget.
Do you mean to say that preserve the .00 decimals on total? Or like for example if I enter "23", you want the .00 to automatically append on 23, so it comes 23.00? This isn't yet supported but we can submit this as a feature request. Kindly confirm if this is what you want.