Regla de tres
Android app by FIZ.U. Tools · FIZ.U
- Store rating
- Unknown
- Store rating count
- Unknown
- Download price
- Free to download
- In-app purchases
- Not listed in captured metadata
- Version
- 9.1.71
- Listing last refreshed
- 2026-09-17
View the original store listing
Store description excerpt
The simple rule of three is a very useful tool for all types of mathematical problems. This application is an aid to find out a precise result, with a clear example always on the screen to avoid any errors. Completely free, it takes up very little space on your cell phone and allows you to calculate with confidence as many times as you need. The simple rule of three has very ancient roots. It is believed that its origin dates back to the first civilizations: *Ancient Egypt and Babylon: The Egyptians, around 1650 BC, already used proportional methods in their calculations, especially in commerce, architecture and agriculture. The Rhind Papyrus, an ancient Egyptian mathematical text, shows problems solved using methods similar to the rule of three. *Greece: The Greeks also explored the idea of proportions. Euclid in his work Elements defined geometric proportion, laying important foundations. *India and the Islamic world: In India, mathematicians such as Aryabhata and Brahmagupta worked with proportional concepts and simple equations. Later, during the Middle Ages, Arab mathematicians expanded these concepts and translated many Greek and Indian texts, preserving and disseminating knowledge. *Medieval and Renaissance Europe: The term "rule of three" as we know it was popularized in Europe in the Middle Ages, especially in treatises on commercial arithmetic. It was called the "golden rule" because it was considered essential for traders and accountants. With the invention of the printing press, arithmetic manuals widely spread their use. A little history never hurts, I hope this application makes many things easier for you. We appreciate your attention and wish you much success with your accounts!
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