フラッシュ暗算

⚡ Flash Mental Arithmetic ⚡
This training app helps you improve your concentration and calculation skills by having you perform mental calculations on numbers that are displayed for just a split second.

It's perfect not only for abacus learners, but also for brain training, exam preparation, and mental exercises during spare time. It can be customized to suit your level, from beginner to advanced.

【Main Features】
🎯 Normal Mode
・Number of Digits: Select from 1 to 3 digits
・Number of Questions: 3 to 10 questions
・Display Speed: 3 levels: Slow/Normal/Fast

🔧 Custom Mode (For Advanced Users)
・Number of Digits: Finely adjustable from 1 to 8 digits
・Number of Questions: Freely adjustable from 3 to 50 questions
・Display Time: Adjust the visible time of the numbers from 50 to 3000ms
・Number Spacing: Adjust the time between numbers from 0 to 1000ms

📊 Recording Function
・Automatically records the accuracy rate of the last 10 attempts
・Automatically remembers the settings used last time and resumes immediately upon next startup

【Recommended for】
・Children attending abacus classes, and instructors
・Those aiming for mental arithmetic or abacus proficiency tests
・Those who want to train their brains or working memory
・Those who want to quickly use their brains in their spare time

With simple operation, you can start practicing whenever you feel like it. By practicing daily, your mental arithmetic speed and accuracy will steadily improve.

It's free to use (ads are displayed within the app).