add sub multiplication math

this app helps you to learn and develop math skills. addition, subtraction and multiplication. they contain a set of operations. where the user builds these various operations depending on electronic surfaces, which contains manual inputs, and additional tables.
after filling in the user can get the correct and wrong answers for each.
there is much you can do to help us spread the joy of education. Share this app with your friends, family, schools, non-profit organizations or just post about it on Facebook or Twitter. A share, a tweet can make a huge difference.
Do you have questions or suggestions? Do not hesitate to contact us at lamb.ilyas@gmail.com