I have used NearPod to introduce math concepts like reading a graph, decomposing fractions, and introducing division. I even did an entire session on iPads in Elementary Mathematics for iPadU using NearPod!
Getting started with NearPod is quite easy thanks to their "Meet Nearpod" presentation that will walk users through the process! Simply create an account on NearPod.com, and you are ready to begin! I have found it is easiest to create the presentation in PowerPoint or GooglePresentation, save the document as a PDF, and upload this to the NearPod website. From there, I can add in any interactives, change the order of my slides, and customize the presentation. Once finished, users must publish the presentation, and the presentation is ready to be activated by a click of a button. During the live session, a unique code will be generated, which students will enter. Once students are logged into the presentation, the teacher is now in control, and can guide students through the presentation. The first time students have their slide change before their eyes they are amazed! A series of "woahs!" and "wows!" can be heard echoing through the classroom. As a teacher, I like being able to have real-time data showing me what students do and do not understand. If needed, I can also return to the data later by accessing the "Assess" section on the website.
I am a huge proponent of NearPod, and I encourage you to download the free app, or create an account on the website, and explore how you can use NearPod in your classroom!