kalcul: Kalcul kalcul: kalcul: Kalcul is an application which helps children at the age of 6 or kalcul: above to improve their mental calculation skills. kalcul: The children can choose between a practice mode in which it is given kalcul: random mathematical exercises of a certain operation (+, -, x or /) kalcul: and a Level mode in which it has to solve existing levels which could kalcul: have been created by a teacher or the parents using the built-in kalcul: Level Editor kalcul: kalcul: