This math formula book has all of the important formulas for mathematics. It also includes a handy calculator for android to calculate any math formula. This android calculator app is very easy to use, with a user-friendly interface.

The user can select from different mathematical functions to calculate, like addition, subtraction, multiplication, and division.

To calculate any of these mathematical formulas, the user can enter the formula in the app, press the equals (=") symbol, and then the result will be shown on the screen. The user can use the up and down arrows to go back to the previous step.

The user can also use the calculator to calculate percentages, such as (a/b) * 100%, where a and b are numbers. The result will be shown on the screen, and the user can use the up and down arrows to go back to the previous step.