OCR GCSE Mathematics key terms

The three dots used to show that an established pattern continues indefinitely.

A transformation that multiplies every distance from a fixed centre by the same scale factor.

Counting or listing all the possible outcomes of a situation.

A statement that two expressions have the same value, written using $=$.

An equation stating that two ratios have the same value, such as $\frac{3}{5}=\frac{12}{20}$.

Outcomes that each have the same chance of occurring.

A mathematical statement showing that two expressions have the same value.

At the same distance from two or more specified points, lines or other objects.

A triangle with three equal sides and three angles of 60°.

Fractions or decimals that represent the same value, such as $\frac25$ and $0.4$.

Expressions that have the same value for every permitted value of their variables.

A fraction obtained by multiplying or dividing both the numerator and denominator by the same non-zero number; it has the same value as the original fraction.

Fractions that have the same value even though their numerators and denominators differ.

Ratios that express the same comparison because every part has been multiplied or divided by the same non-zero number.

Numbers written differently but having exactly the same value, such as $\frac12$, $0.5$ and $50\%$.

The interval of possible actual values that could have produced a stated rounded or truncated value.

A calculation that gives a sensible value close to the exact answer, usually by replacing numbers with convenient approximations.

Finding the numerical value of an expression after values have been substituted.

A whole number that is divisible by 2, including zero and negative whole numbers.

An event with an equal chance of happening or not happening; its probability is 0.5.

An outcome or collection of outcomes whose probability is being considered.

A value written without rounding or approximation, such as a fraction representing an infinite recurring decimal precisely.

A trigonometric ratio written as an exact number, such as a fraction or surd, rather than a rounded decimal.

A value written without rounding or truncation; for example, $3\sqrt2$ is exact whereas $4.24$ is an approximation.

The rate used to convert an amount in one currency into an equivalent amount in another currency.

A point represented by an open circle because its value is not part of the solution set.

A value that a variable cannot take because it would make an original denominator zero or make a division invalid.