Yes, it is possible to do a math challenge in Gravity Forms, however it does use captcha to display the actual math problem so that it can't be defeated by a bot... which can perform calculations.
If you install and activate the Really Simple Captcha plugin from the WordPress.org repository (Login to your WordPress Dashboard, go to Add New Plugins and search for Really Simple Captcha) it will add additional options to the Captcha field in Gravity Forms.
Once installed and activated, add a Captcha field to your form, edit it and select the math challenge option from the field type drop down. You can then configure the colors that are used also.
Posted 10 years ago on Wednesday December 28, 2011 | Permalink