A free program for Android, by Mathpresso.

Do you love solving math and science questions? Do you want to learn how to help students who have problems with studying? Do you want to earn money while doing that? Well, you are in the right place.

Qanda Teacher is an educational and social learning app that allows you to solve questions that are posted by students from all over the world. If you are confident in math and science, you can start helping right away.

This is how it works:

1) Download the app.

2) Choose the topic you want to solve.

3) Solve the question and get the right answer.

4) After solving the question, you will get the points for correct answers and get a percentage.

5) The higher the score, the more you will earn.