Needs some fixes – Mathical Review

I like the idea of the but it needs some fixes. I will try to use the addition game with my son (1st grade). There are two big problems related to speed. First, they are supposed to find the missing integer to complete the equation but the numbers fly at you too fast to think. Second, if you get it wrong the correct answer flashes for only a second and it is small. It should stay on the screen to imprint in their brain.
Review by Ejs0928 on Mathical.