Mental Math Free description

Become good with numbers. Practice makes perfect! Let's enjoy mental math and train your brain!

Features
- Times Table Training(1~99!)
- Useful tips to simplify difficult math problems and exercises to use them.
- Four arithmetic operations training in three difficulty levels
- "Hide Question" mode to train to hold numbers in memory for mental calculation.
- Flash mental calculation

Please let me know any bugs and suggestions, and your secrets of mental math!