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Corners in a quadrilateral
Sum of the four angles in a quadrilateral is 360 degrees. Calculate the size of an angle, based on three given angles.
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Sine function
Elements of the sine function: amplitude, equilibrium line and period. You receive a job description and get the requested information from it.
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Working out squares with remarkable products
Calculate the following squares using the rule of remarkable products.
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Proportions
An exercise on solving proportions: a/b = c/d means ad = bc.
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Distributivity in multiplication
Working out multiplications using distributivity: e.g. 31x11 = (30+1)x(10+1) = 300 + 30 + 10 + 1 = 341.
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Square roots of natural numbers
This exercise is about square roots of natural numbers, which have a natural number as a solution.
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Smoker face
This app uses a selfie to show what your face would look like if you smoked. The negative consequences of smoking are shown on your own face. Useful for smoking prevention and to encourage people to quit smoking.
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Sign of sine, cosine and tangent: Exercises
Exercises on the sign of sine, cosine or tangent (positive, negative, 0, 1 or -1).
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Problems with percentages: Exercise
Problems with percentages about profit, discount, increase and decrease.
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Cube: Unfolding
Development or unfolding of a cube based on various images.
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Polygon: Angles and sides
Find the adjacent and included angles or sides in a polygon.
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Sine, cosine and tangent in a right triangle: Exercise
Exercises on the sine, cosine and tangent in a right triangle.
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