ScreenChomp

ScreenChomp is a free app great for any subject, especially math. It is similar to writing on a white board. There is a red, a black, and a green marker along with an eraser. The great perk to this is that you can record what you write along with your verbal explanation simultaneously. When you are done recording your session, you can save it and share it with friends and the teacher via screenchomp.com or save your own personal notes.
This app could be used when working on math exercises, group work, and lesson explanations. Because you can write, erase, and record your work easily, it's easy to share work done during homework assignments and information with classmates. Having lesson explanations accessible to students 24/7 is helpful for them to review how to do problems. The students could record their math notes as well to refer back to during homework. Group collaborations and other activities are easy to do on this app as well. When the teacher gives a problem, the students could open ScreenChomp, and record how they solve the problem. It shows the teacher how much the student understands.
The ZigZag app is very similar to ScreenChomp. ScreenChomp is more kid friendly. Students starting in the 5th grade could start using ZigZag easily. There are other white board apps that cost money and that have the same uses as these apps. It would be pointless to pay for other apps as ScreenChomp and ZigZag do the same job.