How to calculate questions?

You need to use Form Calculation widget in order to add form fields value. Please check this demo form: https://form.jotform.com/61773737193970

Here's a guide on how to calculate fields:

1. Add two Text Boxes you want to calculate.

2. Go to More Fields, type Form Calculation in the search box and drag it to your form.

3.  In the Calculation wizard, you can set a formula that adds the value of the 2 fields. Here's a screen animation:

Also, please check this user guide on how to perform calculation.

Hope this helps. Let us know if you need further assistance. Thank you!