Calcucil: the mental math game that tests how fast you think

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Calcucil is a free online mental math game for all ages. Every round shows a math operation —addition, subtraction, multiplication or division— with a possible result: you have just a few seconds to decide whether it is correct or wrong. The more right answers in a row, the harder it gets and the more points you score. Your best score is saved on your device so you can try to beat it every time you play. Perfect for sharpening your mind, learning math while playing, or enjoying a quick round on your phone or computer.