# GYAKUSAN - Calculate backward — Improve Math skills with fun!!

> Improve Math skills with fun!! (iPhone/iPad app by TRIAD SOLUTION INC..)

- Source: https://appshunter.io/ios/app/gyakusan-calculate-backward/id6743148876 (this page in markdown: same URL + `.md`)
- Developer: [TRIAD SOLUTION INC.](https://appshunter.io/developer/1553013030)
- Category: Education
- Price: Free
- Age rating: 4+
- Requires: iOS 12.0 · 63 MB
- Languages: American English
- Released: 2025-04-21
- Data updated: 2026-06-04
- User reviews in markdown: https://appshunter.io/ios/app/gyakusan-calculate-backward/id6743148876/reviews.md

## What is GYAKUSAN?

The New type of Math drill.
Making formulas is a good exercise for your brain from the answer. Improve your Math skills!!

All of the four arithmetic operations are provided.
This APP is pretty simple to use, everyone can play and enjoy this APP, and then improve your calculation power.
For kids, it's suitable.

There are 81 stages, from 1-1 to 9-9.(proceeding 1-2,1-3,...,1-9,2-1,2-2,...)
You can get the Medal after clearing these stages in time.

Complete to collect medals, even if Questions can be more difficult in higher stages.

▼For training in calculation
This App provides you with questions using all of the four arithmetic operations.
You rarely show the same question while using this App because this app questions you randomly from huge lots of questions.

▼Simple to use
You can answer question by choosing the number from the options.

▼Medals
You can get medals when you clear a stage.

▼Coins
Only a coin needs to play a stage.
you get 3 coins everyday when the first time you use this App a day.

▼Multi Languages
This app dealt with Japanese and English.

▼Play for free!!

▼Defects/Requests
Please contact us by email at tsiapp005a202503@triad-sol.co.jp.

▼Terms of service
https://www.apple.com/legal/internet-services/itunes/dev/stdeula/


## Version history (last 2 releases)

### 1.0.1 — 2025-04-22

Fixed some malfunctions.

### 1.0.0 — 2025-04-21

No release notes.

## Apps similar to GYAKUSAN

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [ローマ字あいうえお寿司](https://appshunter.io/ios/app/id6738852783) | — | Free | Education |
| [そろばん学習ドリル Ext](https://appshunter.io/ios/app/ext/id1449114393) | — | Free | Education |
| [百桁早打 - 数字入力ゲーム](https://appshunter.io/ios/app/id1661262498) | — | Free | Education |
| [玉手箱対策アプリ](https://appshunter.io/ios/app/id6752010769) | — | Free | Education |
| [Bunsuu calculator](https://appshunter.io/ios/app/bunsuu-calculator/id1525584934) | — | Free | Education |
| [Mental Math - Boost Cal Skills](https://appshunter.io/ios/app/mental-math-boost-cal-skills/id1572014520) | 4.5 (4) | Free | Education |

## More apps by TRIAD SOLUTION INC.

- [Interval Timer Quick](https://appshunter.io/ios/app/interval-timer-quick/id1553013028)
- [TappingGP / Be Fastest Tapper](https://appshunter.io/ios/app/tappinggp-be-fastest-tapper/id6504850367)
- [JustOnTime / Stop it NOW!](https://appshunter.io/ios/app/justontime-stop-it-now/id6657974351)
- [Magic Square -Number Puzzle-](https://appshunter.io/ios/app/magic-square-number-puzzle/id6739323071)

All apps by TRIAD SOLUTION INC.: https://appshunter.io/developer/1553013030

---

*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 2026-06-04.*