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From AXON PRO:
EASY Simple question and four possibilities for answer. Simplest way as memorize how much is 17 x 13. SPACED REPETITION Spaced repetition is a learning technique that incorporates increasing intervals of time between subsequent review of previously learned material; this exploits the psychological spacing effect. Software automatically determine intervals between repetitions. It is a first spaced repetition application for children. Spaced repetition methodology assures life time warranty for memorized words. MORE USERS You can add more users and the whole family can use this application for learning English. MATH In the application is 1470 mathematical examples from 6 categories:* Addition (up to 40)* Subtraction (up to 40)* Multiplication (up to 10x10)* Multiplication (up to 20x20)* Division (2-10)* Division (11-20)