Basic calculator with 9 digits (+2 more for the x10 exponent).
Looks and acts much like a real hand held calculator.
Multiply and Divide things.
Square Root, Reciprocal and Percent Buttons.
Enter numbers as large as 9.99999999E+99 or as small as 1.00000000E-99.
Settings to turn vibrate & sound off and on.
Short user guide in app found by pressing the i button at the top right.