These are the best Calculator apps for iPad (and iPhone) - iOS Hacker
Use Photomath Camera Calculator app; Solve Maths Equations Like a Pro
Scientific & Graphing Calculator - iOS https://itunes.apple.com/us/app /ncalc-scientific-calculator/id1449106995 Android: search "Free Advanced calculator 991 es plus & 991 ex plus" and install app from "Nhi Thien Studio" What new in this version: iOS
Calculate84
10 best calculator apps for Android - Android Authority
10 best calculator apps for Android - Android Authority