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This looks like a good app to improve your math skills and has good reviews
FREE: King of Maths For Android @ Amazon
Reviews
King of Maths is a fast-paced mathematics game with lots of fun and diverse problems in different areas. Starting as a male or female farmer, you level up your character by answering maths questions and improving your total score. New character design and music for each of the ten levels. Collect stars, get achievements and compare your scores against your friends and players all over the world!
- Maths questions and puzzles
- Level up your maths skills
- Become King of Maths