# ChallengeAddition&Subtraction — Add&Sub

> Add&Sub (iPhone/iPad app by koichi kodama.)

- Source: https://appshunter.io/ios/app/challengeaddition-and-subtraction/id6446822143 (this page in markdown: same URL + `.md`)
- Developer: [koichi kodama](https://appshunter.io/developer/1679265192)
- Category: Education
- Price: Free
- Age rating: 4+
- Requires: iOS 11.0 · 58 MB
- Languages: English, Japanese
- Released: 2023-03-27
- Data updated: 2026-05-20
- User reviews in markdown: https://appshunter.io/ios/app/challengeaddition-and-subtraction/id6446822143/reviews.md

## What is ChallengeAddition&Subtraction?

This app is an educational app that allows you to practice addition and subtraction. A wide range of problems from easy to difficult are available, so you can learn at your own level. There are also features for accuracy rate, time, and score, where the score is calculated based on the time and the number of correct answers. By displaying a rank (from G to S) based on the score, it can increase your motivation to learn. If you want to improve your calculation skills, please try this app!
In order to support localization, if the OS language of the device is not Japanese, it will be displayed in English.

このアプリは、足し算と引き算の練習をすることができる教育アプリです。簡単な問題から難しい問題まで、幅広いレベルの問題が用意されており自分のレベルに合わせて学習することができます。また、正解率やタイム、スコアの機能があり、問題を解くのにかかった時間や正解数に基づいて、スコアが計算されます。スコアに基づいたランク（GからS）が表示されことで学習意欲を高めることができます。計算力を伸ばしたい方、是非このアプリをお試し下さい！
ローカライズ対応として端末のOS言語が日本語以外の場合は英語で表示されます。


## Version history (last 2 releases)

### 1.1 — 2023-04-09

In order to support localization, if the OS language of the device is not Japanese, it will be displayed in English.

### 1.0 — 2023-03-27

No release notes.

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| --- | --- | --- | --- |
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| [Carry-Up Robo.](https://appshunter.io/ios/app/carry-up-robo/id562483682) | — | Free | Education |
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## More apps by koichi kodama

- [とけいにチャレンジ！！](https://appshunter.io/ios/app/id6446818704)
- [FlagOdyssey](https://appshunter.io/ios/app/flagodyssey/id6448718172)

All apps by koichi kodama: https://appshunter.io/developer/1679265192

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-05-20.*