Maths Vocab

This is a list of some maths terms with their definition and an example.  (More will be added soon)

Term Definition Example


Acute Angle


​An angle that measures less than 90o.



​The amount of space taken up by a 2D shape or surface.  Area is measured in square units for example cm2 or m2.



​A pictorial representation (rows or dots) to help children to understand multiplication and division.



​The order to complete mathematical calculations.




​The measurement all the way around the outside edge of a circle.



​Numbers that give you a position on a grid marked by how far along they are on the x axis and how far up or down they are on the y axis.  Always write the x axis value first.



​The bottom number of a fraction that tells you how many parts a shape or amount has been divided equally into.


​The length of a straight line through the centre of a circle from one point on the circumference to another point.


​The number you are dividing by.

Equilateral Triangle

A triangle where all sides are the same length and all angles are the same size.



​Converting from one place value to another - a term used instead of "carrying" in addition and "borrowing" in subtraction.



​A whole number which will divide exactly into another number.


Highest Common Factor (HCF)

​The highest number that two or more whole numbers is divisible by.  It could be easier if you listed all the factors of each number.


​Index (Plural: Indices)

​Also know as "power", the index shows how many times the number is used in a multiplication.


Isosceles Triangle

​Triangles that have 2 sides of equal length and 2 angles of equal size.

​Lowest Common Multiple (LCM)

​The lowest number that is a multiple of two or more numbers.



​An average measure that is calculated by adding all the values in a data set together and dividing it by the number of values there are.
​Median ​An average measure that shows the middle value when a group of numbers is arranged in order of size.


​An average measure that shows the value which appears most frequently in a set of data.


​A number that can be divided by a whole number without remainders.


​Number Bonds


​Pairs of numbers that add up to made a certain number.


​The number on the top of a fraction that tells you how many parts you have.
Obtuse Angle ​An angle that measures more than 90o but less than 180o.



​Expanding or breaking down a number into the individual values of each digit - this helps with understanding place value.




​The distance measured around the outside of a 2D shape.


Place Value


​The value of a digit within a number.

Prime Number ​Numbers that only have two factors which are 1 and the number itself.



​The measurement of a straight line from the centre of a circle to any point on the circumference of a circle.



​An average measure that shows the difference between the highest and the lowest value in a data set.



​A comparison between the amounts of different things.


​Reflex Angle

​An angle that measures more than 180o but less than 360o.

Right Angle

An angle that measures exactly 90o.

Scalene Triangle ​A triangle where all the sides are of different lengths and all the angles are different values but one of the angles measures more than 90o.
Square Number ​The value when a number is multiplied by itself.


​x axis


​The horizontal axis on a graph or grid.

Remember: "X is a-cross".


​y axis


​The vertical axis on a graph or grid.



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