Portos

Portos is a free program that currently is perfectly functional in the area of simple math. Solve operations like addition, subtraction ; multiplication, division, percent root block , power, sine, cosine , tangent , logarithm and allows operations with parentheses. Take the default language on your phone , requires a permanent Internet connection.
The user only has to touch the microphone icon located in the lower right corner indicate the mathematical operation that requires speaking naturally and Portos will respond , a dialog box will be displayed in the form of chat where users can tap to re- listen both the question and your answer.