Calculator Plus app invented by Dublin 12-year-old and her dad tops Amazon’s Android App chart
Irish girl’s moaning over her math homework has created a successful family business
Published Tuesday, May 21, 2013, 8:00 AM
Updated Tuesday, May 21, 2013, 9:32 AM
Photo by Calculator Plus
Aidan and Isabel have launched other apps, including Calculator Free, the best-selling Calculator app for Windows 8.