ChallengeAddition&Subtraction
iOS app by koichi kodama. Education · koichi kodama
- Store rating
- 0 / 5
- Store rating count
- 0
- Download price
- Free to download
- In-app purchases
- Unknown
- Version
- 1.1
- Listing last refreshed
- 2026-09-14
View the original store listing
Store description excerpt
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。
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