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Oh No Fractions! - Curious Hat Lab

By Curious Hat

This app is only available on the App Store for iOS devices.


* 2013 Children's Technology Review Editor's Choice Award
* Featured by Apple in the Education Category (Apps for Elementary School, Apps for Middle School)
* Certified by Teachers With Apps "Badge of Distinction" 
* Ranked in 143 App Stores around the world

Visually compare, add, subtract, multiply and divide two fractions with a unique and simple interface.

Explore, play and test your fraction knowledge.

Oh No Fractions! is built on the amazing feedback and response we had with the original free Curious Hat Lab app.

You can perform the following operations on two fractions:
- Compare
- Add
- Subtract
- Multiply
- Divide
Please note that in the Lab Free version Addition, Subtraction, Multiplication and Division are allowed on a limited daily basis.
The Full version of the app, available as separate download, has no restrictions.

The visualization of fractions with simple, effective and interactive graphs, allows the user to explore the solution at each step.

Statistics are kept for each successful and unsuccessful attempt to solve the problems.
This feature is very useful, in the classroom for example, to monitor the child progress.
Stats can now be shared via email.

Oh No Fractions! was featured multiple times by Apple in the Education Store.

Let us know what you think! Write us at

What's New in Version 2.41

Addressed issues that caused the app to freeze under certain conditions.
Please send your comments and suggestions to


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iPad Screenshot 1
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Customer Reviews

It could be helpful

I thought that this app has some good features. It is nice that the students are able to use manipulatives when comparing fractions. However, it shows what the common denminator already is by showing a line that crosses across both bars so if the studnet notices that they are not really finding the common denominator itself.

Simple and effective

My go-to app for fraction drills for my kid.

How do you play?

There were no instructions, no tutorial. There is nothing to indicate how to play this.

Oh No Fractions! - Curious Hat Lab
View in iTunes
This app is designed for both iPhone and iPad
  • Free
  • Category: Education
  • Updated:
  • Version: 2.41
  • Size: 4.8 MB
  • Languages: English, French, Italian
  • Seller:
Rated 4+
  • Made for Ages 9–11

Compatibility: Requires iOS 5.1 or later. Compatible with iPhone, iPad, and iPod touch.

Customer Ratings

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