暗算30秒トレーニング(暗算アプリ・脳トレ・計算力UP)

You can practice mental arithmetic in 30 seconds.
Train your math skills by doing more mental arithmetic.

■5 types of training
- Addition
- Subtraction
- Multiplication
- Split
- mix

■Features
- 30 seconds of intensive training
- Personal best confirmation


■Credit
SE -> OtoLogic (https://otologic.jp/)
BGM -> Pocket Sound (https://pocket-se.info/)