Math Clash

Multiplication of two digits, like "12 x 17." Wouldn't you like to be able to solve it mentally?
"Minkei" is Japan's first full-scale calculation training dojo specializing in double-digit x double-digit mental arithmetic.
Come and enjoy competitions and time attacks!

We'll explain nine easy-to-understand calculation techniques so anyone can master mental arithmetic. Mastering each one will dramatically improve your calculation speed.

What you can do with "FlashMath - Online Mental Arithmetic Battle"

📖 Learn Techniques: Learn nine tips with easy-to-understand illustrations to dramatically speed up your calculations, such as "multiplication of 11-19" and "multiplication with the same tens digit." Train thoroughly in the dedicated practice mode.

⏱️ Experience your growth: Challenge your concentration and speed for three minutes in "Time Attack" mode! Your daily score is automatically graphed, so you can see your progress at a glance.

🔥 Test your skills: Use the "Online Battle" feature to challenge rivals from all over the country! Serious battles with betting ratings will take you to new heights. You can also challenge friends to password battles.

Don't let anyone say you're bad at math anymore.
Experience a dramatic improvement in your calculation skills!