Simple, but accurate – Calculator for iPad! Review

I have a simple test that I have used for over 40 years to pre-test the versatile usability of a calculator, and so many have failed. Try it: 10 / 3 = , then x 3 = . If the answer isn't 10 then I don't buy that calculator. Aren't all those repeating 999999's irritating? This app has replaced the dumb one.
Review by Jaxway47 on Calculator for iPad!.