Math dictionary

The distance of a number from zero — always non-negative.

An angle smaller than 90°.

The amount of surface a flat shape covers, in square units.

A statement accepted without proof — a starting point for further reasoning.

The number being raised to a power.

The distance around a circle. C = 2πr or πd.

The number that multiplies a variable.

An LK20 learning objective describing what a student should be able to do at the end of a grade.

The bottom number in a fraction.

A straight line through the centre of a circle, from edge to edge. Twice the radius.

The set of inputs a function accepts.

A mathematical statement that two expressions are equal.

A small raised number telling you how many times to multiply the base by itself.

A combination of numbers, variables and operations — without an equals sign.

A number that divides another number exactly, with no remainder.

A number written as one whole number over another, representing a part of a whole.

A rule that gives exactly one output for each input.

The longest side of a right triangle, opposite the right angle.

A statement that two values are not equal — using <, >, ≤ or ≥.

A whole number, positive, negative or zero.

One of the two shorter sides of a right triangle, next to the right angle.

The Norwegian school curriculum introduced in 2020.

The inverse of an exponent — log_b(x) answers 'what power of b gives x?'

The arithmetic average — sum the numbers, divide by how many there are.

The middle value when the numbers are listed in order.

The value that appears most often in a list.

A number you get by multiplying another number by a whole number.

The top number in a fraction.

An angle bigger than 90° but less than 180°.

A number out of 100, written with the % sign.

The total distance around the outside of a shape.

The ratio of a circle's circumference to its diameter — about 3.14159.

An expression with one or more terms, each a constant times a power of a variable.

A whole number greater than 1 whose only factors are 1 and itself.

How likely an event is, given as a number between 0 and 1.

A statement that two ratios are equal.

The distance from the centre of a circle to its edge.

The set of outputs a function actually produces.

A way to compare two quantities by division — written 3:5 or 3/5.

A number that can be written as a fraction of two integers.

An angle of exactly 90°.

A value that makes an equation true, or the inverse of a power (e.g. square root).

A collection of distinct objects, treated as a single thing.

How steep a straight line is — change in y divided by change in x.

A single piece of an expression separated by + or −.

A mathematical statement that has been proved true.

A symbol — usually a letter — that stands for a number.

A point where two or more edges of a shape meet.

How much space a 3D object takes up, in cubic units.