If a number is divisible by 3, - it is divisible by 1 and itself as well., The perimeter of a polygon is - the sum of all its sides., The area of a triangle is calculated by - you multiply the base by the height and divide by 2., When you increase a quantity by 15%, - you add 15% of its original value to itself., If a fraction is simplified, - it has been rewritten in its lowest terms., The square of a negative number is - it becomes positive., When two lines are perpendicular, - they meet at a right angle., A quadratic equation has real solutions if - its discriminant is zero or positive., When the mean is greater than the median, - the data is skewed to the left., To calculate the probability of an event, - you divide the number of favourable outcomes by the total number of possible outcomes., The circumference of a circle is - the difference increases., A rational number is - π times the diameter., If the numerator of a fraction is zero, - it is equal to zero., The volume of a cuboid is found by - multiplying length × width × height., When two triangles are congruent, - they have exactly the same size and shape., The median of a data set is - the middle value when data is arranged in order., If two events are mutually exclusive, - the sum of their probabilities equals 1., The gradient of a line is - the ratio of the vertical change to the horizontal change., If a quadratic function opens upwards, - its vertex represents the minimum point., When a number is expressed as a percentage, - it is written as a number out of 100., The mode of a data set is - the value that occurs most frequently., When you subtract a negative number, - longer than either of the other two sides., The hypotenuse of a right triangle is - you find the solution that satisfies both equations., When solving simultaneous equations, - π × radius²., The area of a circle is - it cannot be written as a fraction., A number is irrational if - the two angles add up to 180°., If an angle is supplementary to another, - the set of all possible output values., The range of a function is - combining like terms and simplifying coefficients., When simplifying an algebraic expression, - zero., The probability of an impossible event is - a number expressed in decimal or fraction form.,

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