| Calcul helps elementary school students practice mental arithmetic and fractions. Choose addition, subtraction, multiplication, division or fractions; then set the range of numbers and the number of calculations for an exercise. The program displays two numbers or fractions respectively, and the user enters an answer. Right or wrong answers prompt appropriate audio feedback, and there's a pie chart to show the percentage of correct responses. For a greater challenge, play against a friend or set a time limit for a correct answer. The interface and sounds are available in English or German. More languages are supported.
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