# Mental Arithmetic - Math

> Mental math training: drills, weak-spot diagnosis & mastery map

Canonical page: [https://chrome-stats.com/d/com.yichuan.arithmetic](https://chrome-stats.com/d/com.yichuan.arithmetic)

## Overview

- **ID:** `com.yichuan.arithmetic`
- **Platform:** Android
- **Type:** Android app
- **Status:** Available
- **Publisher:** Yichuan
- **Category:** EDUCATION
- **Downloads:** 82
- **Version:** 2.0.2
- **Last updated:** 2026-08-07
- **First published:** 2025-07-16
- **Publisher country:** CN
- **Size:** 9.16 MB
- **Data as of:** 2026-09-14
- **Store listing:** [Google Play Store](https://play.google.com/store/apps/details?id=com.yichuan.arithmetic)
- **Website:** [https://espimx.github.io](https://espimx.github.io/)
- **Privacy policy:** [https://gist.github.com/espimx/4092785be43ca801d7c9b698272231fd](https://gist.github.com/espimx/4092785be43ca801d7c9b698272231fd)

## Description

Mental Arithmetic — a portable mental math training system. Build fundamentals, break through weak spots, and see your progress clearly.<br><br>SYSTEMATIC PRACTICE<br>• Addition, subtraction, multiplication, and division<br>• Integers, decimals, and fractions<br>• Four difficulty levels; adjustable question count and time limit<br>• Dynamic questions—start a basic session anytime<br><br>FOCUSED TRAINING<br>• Weak-spot diagnosis: pinpoint structural gaps (borrowing, carrying, times tables, and more)<br>• Technique dojo: make-ten, complement multiply, distributive law, and more—learn the method, then practice<br>• Rhythm flow: train steady speed, not frantic rushing<br>• Number-sense estimation: magnitude estimates and quick comparisons (correct within tolerance)<br><br>DAILY DIAGNOSIS<br>A short, auto-planned session based on your weak areas and due reviews—a clear reason to open the app every day.<br><br>PROGRESS YOU CAN SEE<br>• Skill mastery map across micro-skills<br>• Statistics: accuracy, speed, recent volume, and long-term trends<br>• Practice calendar with monthly comparisons to build a lasting habit<br><br>For students building foundations, adults rebuilding fluency, and anyone who wants mental math that is faster, steadier, and clearer.<br><br>Start today. Progress gets clearer from here.

## Rankings

- #2,057,179 — Overall

## Permissions and access

### Permissions

- `android.permission.ACCESS_ADSERVICES_AD_ID`
- `android.permission.ACCESS_ADSERVICES_ATTRIBUTION`
- `android.permission.ACCESS_ADSERVICES_TOPICS`
- `android.permission.ACCESS_NETWORK_STATE`
- `android.permission.FOREGROUND_SERVICE`
- `android.permission.INTERNET`
- `android.permission.WAKE_LOCK`
- `com.android.vending.CHECK_LICENSE`
- `com.google.android.finsky.permission.BIND_GET_INSTALL_REFERRER_SERVICE`
- `com.google.android.gms.permission.AD_ID`
- `com.yichuan.arithmetic.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION`

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Source: [Chrome-Stats](https://chrome-stats.com/d/com.yichuan.arithmetic)