A calculator developed by a 12-year-old girl and her Irish father has become the number one-rated app worldwide on Amazon's Android App Store.
Calculator Plus, invented by Isabel Hughes and her Father, Dublin native Aidan, has been downloaded 2.5-million times.
Isabel came up with the idea for the chart-topping Fraction Calculator Plus while doing her maths homework with her Dad.
Speaking from Washington, where they now live, Aidan Hughes explains their eureka moment, and talks about the reaction Belle has been getting from classmates:
} ], { swfPath: '/assets/includes/js/jPlayer', supplied: 'mp3', wmode: 'window', solution: 'flash, html' });
An 'App' is short for an 'Application' which is is a downloadable programme you can use on your smartphone.
