If you think your math is very good, then to challenge the math master it, the method is very simple: through the appropriate mathematical equation, the result is equal to zero, and let the grid of all the squares disappeared that victory.
Began as a simple exercise, behind the numbers and operations will be more and more, more and more complex, if you want to become the true masters of mathematics, in addition to find the correct operation equation, also need to choose the correct order of operations! As long as one step is wrong, you are likely to get stuck in this case, you can use the left corner of the "re" button to start again to try the new correct computing equation and order.
You are not able to become a real master of mathematics? You come to a challenge to know, small partners to quickly download it! I wish you success!