Our calculator in the game Countdown Calculator will start countdown, as soon as you decide to start a mathematical marathon. null Test your quick scoring skills. null On the screen under the watch there are new examples, you need to determine the correctness of their solutions and click the appropriate button: red - wrong, green - right. null It is necessary to think very quickly, because the timer counts down seconds with a crazy speed. null If the answer is correct, the countdown stops and the time is added. null If the limit is exhausted, the Countdown Calculator game ends. null Do not miss the mathematical simulator, it will help you to find solutions faster and improve mathematical knowledge. null