Handy Rule of Three app for iPhone and iPad

4.4 ( 9504 ratings )

Productivity Education
Developer: Chido Games S.A. de C.V.

Free

Current version: 2.0, last update: 6 years ago
First release : 17 Nov 2013
App size: 11.74 Mb

This is a Handy Rule of Three that will help you out to solve those little math problems you may encounter in your daily life.

Handy Rule of Three supports the direct and inverse rule of three.

Direct mode C*B/A
If an exam has 30 questions which makes 100%
What percentage makes 24 correct answers?

x= 20*100/30
x= 80

Inverse mode A*B/C:
If making dinner takes 3 hours to 2 people.
How long would it take to 1 person?

x= 3*2/1
x= 6