OCR GCSE Mathematics key terms

A sequence whose first differences change by a constant, non-zero amount; its position-to-term rule is quadratic.

A closed, flat polygon with four straight sides and four vertices.

The result of dividing one quantity by another.

The number or expression beneath a root sign; for example, 7 is the radicand in $\sqrt{7}$.

The perpendicular distance from the centre of a circle to its circumference.

A possible result whose occurrence is uncertain, such as getting heads on a coin toss.

An experiment with an unpredictable individual result, even if some results are more likely than others.

The difference between the greatest and least values; it measures spread rather than average.

How much one quantity changes for each unit change in another quantity.

An amount earned for each unit of time worked, such as pounds per hour.

A comparison of two quantities by division, such as 6 litres gained for every 2 minutes.

To rewrite a fraction in an equivalent form with no surd in its denominator.

One of the numbers in a ratio, representing a number of equal shares rather than necessarily the actual quantity.

A graph that shows how two quantities in a practical situation are related.

To change the form of an equation without changing the relationship it represents.

A check that compares an answer with an estimate to decide whether its size and sign are plausible.

The multiplicative inverse of a non-zero quantity; the reciprocal of $x$ is $\frac1x$.

A function of the form $y=\frac{k}{x}$, where $k$ is a constant and $x\ne0$; $y=\frac1x$ is the simplest example.

A graph involving the reciprocal $\frac{1}{x}$; for $y=\frac{1}{x}$, each non-zero $x$ is paired with $1$ divided by $x$.

A quadrilateral with four right angles.

A figure made entirely from straight line segments.

A shape whose sides are straight and meet at right angles.

The digit or shortest block of digits that repeats indefinitely in a recurring decimal.

A decimal whose digit or block of digits repeats indefinitely after the decimal point.

A transformation that produces a mirror image in a specified line.

Symmetry in which reflecting a shape across a line leaves it looking unchanged.

An angle greater than 180° but less than 360°.

An area of a coordinate grid representing coordinate pairs with a shared property.