암산 학습 (Learn Mental Math)

What if you could calculate quickly and accurately without a calculator?

The secret to mental arithmetic is simplifying complex numbers. Anyone can become proficient in mental calculation by avoiding carrying over and borrowing, and by minimizing the amount of information to remember.

Learn Mental Math is not just a simple repetitive drill app. For each topic, it explains the principles behind the calculations and visualizes the actual mental calculation process through step-by-step animations.

📚 Included Topics (Arithmetic Operations)

Complement of 10s

Subtraction from 100 / 1000 / 10000

Adding by Passing (97+35 → 100+32)

Subtracting Together

Multiplying the Larger Number by 2 (Starting with the Lead!)

Multiplying Numbers Ending in 5 and Even Numbers

Multiplying by 25

Multiplying by 99

Multiplying by 33

...More diverse topics to be added in the future...

✨ Key Features

Explanations of calculation principles and examples for each topic

Step-by-step explanation animations showing the mental calculation process

Saving problem-solving records and accuracy statistics

Mastery Judgment System (Last 10 attempts, overall average under 15 seconds)

Advertisement speed adjustable

Backup and restore solution history

100% Free · No Ads · No In-App Purchases

🌍 Supported Languages

Korean · English · Japanese · Chinese (Simplified) · Chinese (Traditional) · German · Spanish · Português · Français

📝 A Message from the Creator

Hello, this is CommonMathTeacher. I teach mathematics in South Korea, and I created this app using Vive Coding with Claude Sonnet 4.6 in my spare time while taking care of my two daughters.

As we all live through a turbulent era, we harbor both hope and worry about the future. I would be happy if this app could be of some small help in maintaining and further illuminating your individual intellectual abilities and potential.

— CommonMathTeacher