# 20/20 Rational Expressions — The math tutor in your pocket.

> Math tutor for rational expression simplification and equation solving. (iPhone/iPad app by Walter Kissach.)

- Source: https://appshunter.io/ios/app/2020-rational-expressions/id306583536 (this page in markdown: same URL + `.md`)
- Developer: [Walter Kissach](https://appshunter.io/developer/293232788)
- Category: Education, Reference
- Price: $0.99
- Age rating: 4+
- Requires: iOS 18.0 · 2 MB
- Languages: English
- Released: 2009-03-05
- Data updated: 2026-07-01
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/2020-rational-expressions/id306583536/reviews.md

## What is 20/20 Rational Expressions?

A power learning aid combines Guides, Practice and Coaching Calculators to help students master rational expression or rational fraction simplification and rational equation solving.

Rational expression Practice and Coaching Calculators take you step-by-step through the simplification of expressions such as :

(6x³ + 7x² - 1)/(2x² + 3x + 1)
(x² + 6x + 8)/(x + 2)
(x² - 5x + 6)/(14 + 3x - 5x²) 
(3x - 9)/(6x - 12)

Detailed steps :

 - Factoring out numeric or algebraic factors
 - Factoring linear numerators/denominators
 - Factoring quadratic numerators/denominators
 - Factoring cubic numerators/denominators
 - Dividing out or canceling common factors

Rational equation Practice takes you step-by-step through the solving of equations such as :

(5x + 3)/4 + (1 + 3x)/5 = 4/5
2/(3x²) + 5/x = 3/(4x)
1/(3x + 6) - 3/(5x² + 8x - 4) = -5/(15x - 6)
(2x - 1)/(3x + 2) - (1 - x)/(6x² + 7x - 2) = 7/20

Detailed steps :

 - Factoring denominators
 - Finding Least Common Denominator (LCD)
 - Multiplying through by LCD or making each term have LCD
 - Solving resulting linear or quadratic equation

The Guide also covers the addition and subtraction of rational expressions such as

3/(x + 1) + 2x/(x² - 6x - 7)

and the multiplication and division of rational expressions such as

(x² - 1)/(9x² - 1)  * (6x + 2)/(3x² - 3x).

## Key features

- Rational expression simplification
- Rational equation solving
- Step-by-step guidance
- Practice exercises
- Coaching calculators
- Addition and subtraction of rational expressions
- Multiplication and division of rational expressions

## Recent user reviews (8 of 8)

All indexed reviews: https://appshunter.io/ios/app/2020-rational-expressions/id306583536/reviews.md

### 1/5 — Bad

*2020-02-23*

Can’t solve any questions

### 1/5 — do not buy

*2018-09-17*

this was such waste of money

### 1/5 — Trash

*2018-06-25*

Horrible app. Not helpful in any way and hard to understand/ work. Total waste of money.

### 1/5 — Stupid app

*2017-02-26*

This app is charging me and it's stupid it doesn't work

### 1/5 — Terrible pretending that you can use it to help you threw work when your stuck

*2017-02-21*

Waste of money do not buy

### 1/5 — Crap

*2016-08-25*

Does not do what it claims to do.

Worthless junk.

### 1/5 — Horrible

*2013-02-27*

This was a complete waste of money and time

### 2/5 — Guide

*2010-02-26*

This is not what I expected. I thought it was going to do the work for me, but actually it only goes over the basics with one to two examples. Don't waste your time and money with this, unless if you want a short lesson on how to do it.

## Frequently asked questions about 20/20 Rational Expressions

### What math topics does 20/20 Rational Expressions cover?

20/20 Rational Expressions focuses on mastering rational expression simplification and rational equation solving. It covers factoring, addition, subtraction, multiplication, and division of rational expressions, as well as solving various types of rational equations.

### How does 20/20 Rational Expressions help students learn?

The app acts as a math tutor by combining Guides, Practice exercises, and Coaching Calculators. It provides detailed, step-by-step solutions to complex problems, allowing students to follow along and understand the process.

### Is 20/20 Rational Expressions suitable for all devices?

Yes, 20/20 Rational Expressions is available for both iPhone and iPad, making it accessible to a wide range of Apple users.

### What is the age rating for 20/20 Rational Expressions?

The app has an age rating of 4+, indicating it is suitable for a broad audience, though its content is most relevant for students learning algebra.

### How often is 20/20 Rational Expressions updated?

The latest version of 20/20 Rational Expressions is 8.7, and it was last updated on September 17, 2025, suggesting regular updates to maintain functionality and content.

### Does 20/20 Rational Expressions have ads?

No, 20/20 Rational Expressions is ad-free, providing an uninterrupted learning experience for users.

### What is the price of 20/20 Rational Expressions?

20/20 Rational Expressions is a paid application, available for a one-time purchase of $0.99.

### Can 20/20 Rational Expressions help with specific types of rational expressions?

Absolutely. The app provides step-by-step guidance for factoring numeric or algebraic factors, linear and quadratic numerators/denominators, cubic numerators/denominators, and canceling common factors.

## Version history (last 5 releases)

### 8.7 — 2025-09-17

This version is iOS 18 compatible and contains minor bug fixes.

### 8.6 — 2024-04-09

This version contains minor bug fixes.

### 8.5 — 2024-03-31

Rational expressions with cubic, quadratic, linear polynomials  ... all clearly explained.

### 8.4 — 2022-12-11

This version has minor bug fixes.

### 8.3 — 2022-09-06

This version contains minor bug fixes and enhancements.

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## More apps by Walter Kissach

- [Quadratic Inequalities](https://appshunter.io/ios/app/quadratic-inequalities/id293232785)
- [Circles and Equations](https://appshunter.io/ios/app/circles-and-equations/id293619582)
- [Even and Odd Polynomials](https://appshunter.io/ios/app/even-and-odd-polynomials/id293668394)
- [Quadratic Factoring](https://appshunter.io/ios/app/quadratic-factoring/id294040055)
- [Quadratic Equations](https://appshunter.io/ios/app/quadratic-equations/id294195555)
- [20/20 Fraction Basics](https://appshunter.io/ios/app/2020-fraction-basics/id298766849)

All apps by Walter Kissach: https://appshunter.io/developer/293232788

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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 2026-07-01.*