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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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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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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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Angles in a triangle
Sum of the three angles in a triangle = 180 degrees.
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Types of triangles
Types of triangles:
- acute-angled,
- obtuse-angled,
- rectangular,
- isosceles,
- equilateral.
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Scale: Conversions
Scaled exercises: scaled distance compared to actual distance.
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Fraction of a number
Calculate the fractions of numbers (example: how much is 1/4 of 120?)
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