Math Clash

Multiplication between two digits, like "12 x 17." Wouldn't you like to be able to solve it mentally?
"Math Clash" is Japan's first full-scale math 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. Master each one and dramatically improve your calculation speed.

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

📖 Learn Techniques: Learn nine tips with easy-to-understand illustrations to dramatically speed up your calculations, including "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!