Can I add conditional logic to hide or show fields depending on some values?

Can I add in a conditional requirement to hid/show fields depending on value? 

Example If >40, show field 3, if

Yes, it's possible to show or hide fields based on user's answer. Please follow our guide on how to do so here: https://www.jotform.com/help/316-How-to-Show-or-Hide-Fields-Base-on-User-s-Answer

For more information on creating smart forms using conditional logic, please see our guide here: https://www.jotform.com/help/57-Smart-Forms-Using-Conditional-Logic

I hope this helps. If you need further assistance please let us know. Thank you.

I see that there are simple conditional options but nothing for range.

Can I ask for a value and give conditional responses based on the range?

Example:

If entered 1-6 then form 1

If entered 7-10 then form 2

Regarding the range case you can accomplish that through a combination of conditions joined by "if all" so you would have something similar to the following logic for the first part you mentioned:

I hope this helps.