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Seattle Father and Daughter Duo Top Amazon Kindle Fire Charts

Related: Amazon Kindle Fire, Apps
Seattle Father and Daughter Duo Top Amazon Kindle Fire Charts

A father and daughter duo from Seattle have worked together to develop a calculator app which has hit the top of the Amazon Kindle Fire charts.

Calculator Plus, invented by Aidan and Isabel Hughes (12), is now the number one calculator app for the Kindle Fire tablet in the US and UK and is the second-highest rated app in all categories out of a total of 66,280 apps on Amazon's Android App Store.

They had a special reason to celebrate the New Year when they reached one million copies downloaded on Dec 29.

USA Today recently named Calculator Plus as one of their 25 essential Kindle Fire apps and Amazon have pre-installed it on their shop demo models across the US.

Their new Windows 8 app, Calculator Free, is already the most downloaded calculator on that platform after just a month.

Calculator Plus is now available for smartphones from the Google Play Store and the Apple App Store by searching under the firm's name, Digitalchemy.

This is a second success for Aidan and his daughter Isabel (12), who have also invented a unique way to work with fractions.

Fraction Calculator was conceived by the duo while Isabel was doing her math homework in Seattle, Washington.

"After a page of checking answers to fraction problems, we were both exhausted!" said Aidan (41) originally from Dublin, Ireland.

"I knew there had to be a better way, and I thought of a fraction calculator with three keypads that would be fast and easy."

The app has two great features not found elsewhere: An innovative three-keypad layout to enter fractions and a large, easy to read, display that shows fractions the way you write them.

Fraction Calculator was recently released on the Amazon Kindle Fire, where it rapidly rose to the number one paid calculator spot. It's been in the top five ever since.

"The beauty of the new Calculator Plus app is that it remembers everything you calculate, which makes it perfect when you're working on a number of different tasks, or for comparing things while shopping," said Aidan.

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