To log in to the Imagine Math Facts student web app Open a supported web browser and go to mathfacts.imaginelearning.com. Enter the student username, password, and Site Code (if necessary), then click Save to store the Site Code. Click Log In. You can create a bookmark for the web app that eliminates the need for initial authentication. If that process is not in place, students must enter and save a Site Code the first time they log in.