# Rule of 3- CrossMultiplication — The quick ratio calculator

> Calculator for product multiplication and ratio problems. (iPhone/iPad app by emmanuel orvain.)

- Source: https://appshunter.io/ios/app/rule-of-3-crossmultiplication/id1066731478 (this page in markdown: same URL + `.md`)
- Developer: [emmanuel orvain](https://appshunter.io/developer/1025308595)
- Category: Productivity, Utilities
- Price: $0.99
- Rating: 5.00/5 from 5 App Store ratings
- Age rating: 4+
- Requires: iOS 9.0 · 27 MB
- Languages: English, French, German, Italian, Japanese, Portuguese, Chinese, Spanish
- Released: 2015-12-16
- Data updated: 2026-06-10
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/rule-of-3-crossmultiplication/id1066731478/reviews.md

## What is Rule of 3?

THE most useful application to perform product multiplication(rule of 3). The PRO version is provided without Ads, for a better user experience.

The result can be copied to the clipboard with a shortcut button.

## Key features

- Product multiplication calculation
- Ratio problem solving
- Quick copy to clipboard
- Ad-free PRO version


## Frequently asked questions about Rule of 3

### What is Rule of 3 used for?

Rule of 3 is a mathematical method used to solve problems involving proportions. This application helps you perform these calculations quickly and efficiently.

### Does Rule of 3 have ads?

The PRO version of Rule of 3 is provided without ads for a better user experience. The base version's ad presence is not specified, but the paid version guarantees an ad-free environment.

### What devices is Rule of 3 available on?

Rule of 3 is available on iPhone, iPad, and iPod devices, making it accessible for Apple users across different platforms.

### How often is Rule of 3 updated?

The latest version of Rule of 3 is 3.8, and it was last updated on August 24, 2022. This indicates a history of maintenance and potential improvements.

### What is the price of Rule of 3?

Rule of 3 is available for purchase at $0.99. This one-time payment grants you access to its calculation features.

### What is the age rating for Rule of 3?

Rule of 3 has an age rating of 4+, making it suitable for a wide range of users, including younger students learning about proportions.

### Can I copy results from Rule of 3?

Yes, the result of your calculation can be easily copied to the clipboard with a shortcut button, allowing for seamless integration into other documents or applications.

### How does Rule of 3 compare to other calculators?

Rule of 3 is specifically designed for product multiplication and ratio problems, offering a streamlined experience for these particular calculations compared to general-purpose calculators.

## Version history (last 5 releases)

### 3.8 — 2022-08-24

Minor bug fixes

### 3.6 — 2021-10-30

- Improve User Interactions

### 3.5 — 2021-05-19

- Improve keyboard management

### 3.4 — 2021-05-16

- Add export feature
- Improve UI

### 3.3 — 2021-01-23

Improve system

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## More apps by emmanuel orvain

- [Controlled Breathing pro](https://appshunter.io/ios/app/controlled-breathing-pro/id1035566040)
- [French Lafontaine's fables](https://appshunter.io/ios/app/french-lafontaines-fables/id1037581221)
- [Rule of 3 - Lite](https://appshunter.io/ios/app/rule-of-3-lite/id1043084485)
- [Animals and sounds quiz](https://appshunter.io/ios/app/animals-and-sounds-quiz/id1048354587)
- [Pixl Quiz - Movie](https://appshunter.io/ios/app/pixl-quiz-movie/id1056140801)

All apps by emmanuel orvain: https://appshunter.io/developer/1025308595

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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 2026-06-10.*