All that aside, I think the Number Sense HD Mathomatix has some core value in the mathematical ideas it has its participants play with. BoosterBalls, Do the Dotty, Numberella, Fishoonka and Toot Toot Train are presented in a logical sequential order leading participants to play with counting, understanding numbers from lowest to highest, biggest to smallest, developing the concepts of less than and greater than, more than and less than, and the idea of equality and equal groups as well as pushing children to count on.
After exploring the apps we had pre-loaded, I ordered a few other free apps and I found one I think would be good for third grade students. It is basically practice for mental addition practice for pairs of numbers adding to whatever number you want to set: e.g., I played it with pairs to 100. It is called Find Sums and is listed under educational apps at the Apple Store. There is also a multiple app and a fraction app, which I have explored.