Mad Math

In this game you need to solve arithmetic tasks quickly.

There is a task and 4 possible answers on the screen.
You need to choose the correct answer before the time is up.

It seems to be easy, but can you score at least 25 points?

If you're sure you can, compete with people from all over the world! 

The online game consists of five rounds.
The winner is the one who gives more correct answers.
If the score is tied the winner is the one who responds quickly.