From 1st grade to 6th grade, there are 4,000 math calculation problems learned in elementary school. Learn the basics by practicing repeatedly in small steps!

There are a whopping 4,213 math calculation problems taught in elementary school from 1st to 6th grade!

Menu structure by grade/field. You can practice repeatedly with small steps, so you can master the basics firmly.

It is easy to learn because you can write intermediate calculations on the screen with your finger, and explanations are included so you can clearly understand the answer strategy and intermediate calculation formulas.

Five questions are asked each time.

If you get a perfect score, you will receive a ``Well done'' or ``Kenkaiden'' mark.

It has a very simple and easy-to-use design, and you can enjoy using it continuously for a long period of time.

We apologize for the inconvenience, but please refrain from using it on devices owned by organizations such as schools, after-school children, and cram schools.

If you find a problem, please contact us by tapping the gear icon at the top left of the screen after launching the app and clicking "Contact Us".

The "Hanpuku" learning series, which includes this app, has become a popular series with over 30 million downloads.

"Calculation Ninja" is a registered trademark of Gakko Net Co., Ltd.

"Hanpuku" is a registered trademark of Gakko Net Co., Ltd.