"Math Vocabulary" - The Language of Mathematics

Learn Math Vocabulary in English through pictures and videos.

The language of mathematics is the system used by a mathematician to communicate mathematical ideas among themselves. This language consists of a substrate of some natural language (for example English) using technical terms and grammatical conventions that are peculiar to mathematical discourse, supplemented by a highly specialized symbolic notation for mathematical formulas.

Contents

Math Vocabulary

Below is the list of math vocabulary in English.

+: plus/add
–: minus/take
x: multiply/times
:: divide
=: equals
<: less than
>: more than
%: percentage
#: is not equal to

How to Say and Write Numbers in English

“Angles” Vocabulary

An angle equal to 1/4 turn (90° or π/2 radians) is called a right angle. Two lines that form a right angle are said to be normal, orthogonal, or perpendicular.
A pair of angles opposite each other, formed by two intersecting straight lines that form an “X”-like shape, are called vertical angles or opposite angles or vertically opposite angles.
Angles larger than a right angle and smaller than a straight angle (between 90° and 180°) are called obtuse angles (“obtuse” meaning “blunt”).
An angle equal to 1/2 turn (180° or π radians) is called a straight angle.
Angles larger than a straight angle but less than 1 turn (between 180° and 360°) are called reflex angles.
An angle equal to 1 turn (360° or 2π radians) is called a full angle, complete angle, or a perigon.
Angles that are not right angles or a multiple of a right angle are called oblique angles.
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