Kindergarten math skills can be built and practiced in this app. The simple user interface is easy to pick up, with various levels of difficulty.
There are three difficulty levels with numbers that are between 1 and 9 (level 1), 1 and 12 (level 2), and 1 and 20 (level 3). Each of these can be done as either addition or subtraction. Then there are three practice modes with the problems represented pictorially with a prompt, represented on number lines, and with only numeric representations.
After 20 correct questions, your student can email the results, continue to the next difficulty, or keep practicing the same difficulty. If they choose to keep practicing they will be asked again ever 10 correct questions.