# Maths Glossary for 11 Plus Exam #### acute angle

An angle whose measure is greater than 0° and less than 90°

#### acute triangle

A triangle in which all three angles are acute

Angles that share a common side, have the same vertex , and do not overlap

#### algebra

the part of maths that deals with finding missing numbers in equations.

#### a.m.

the time between midnight and midday

#### analogue time

the time written in words using a clock with hands. #### angle

A geometric figure formed by two rays that have a common endpoint

#### area

the surface of a shape measured in square units

• e.g. square centimetres or cm2
• square metres or m2

#### arc

a part of the circumference of a circle. #### capacity

how much liquid a container will hold, measured in litres (l) or millilitres (ml), or pints or gallons. Same as volume

#### circumference

the distance around a circle. #### clockwise

moving around a circle or a point in the direction of the hands of the clock #### congruent

Having the same size and shape

#### consecutive numbers

numbers that follow on in order.

#### concentric circles

circles that share the same centre point but have a different radius.

#### coordinate

a coordinate is a pair of numbers used to locate a point.

The first number is the distance along the horizontal line and the second number is the distance along the vertical line.

#### cube

a cube is a regular 3-D solid shape where every face is an identical square and every angle is a right angle.

#### cubic centimetre

the volume of a cube that is 1 cm wide, 1 cm deep and 1 cm high

cubic centimetre  = cm3

#### cuboid

a 3-D solid shape where each surface is a rectangle (includes squares) and every angle is a right angle

#### cylinder

a 3-D solid with two flat circular faces joined by one curved surface

#### decimal

A number that uses place value and a decimal point to show tenths, hundredths, thousandths, and so on

Example

• 43.21

#### degrees

degree (o) is the unit of measurement for

1. temperature
2. the unit of measurement of angles, with 360 degrees making one complete turn

#### denominator

The bottom part of a fraction

#### digital time

the time written in numbers, as you would see on a digital clock. #### diameter

the distance across a circle passing through the centre #### difference

to find the difference between two numbers, take the smaller number away from the larger number

#### digit

a digit is any of the numerals 0, 1, 2, 3, 4, 5, 6, 7, 8, 9

1 dozen = 12

#### edge

the edge of a solid shape is the line along which two adjacent faces meet

#### equation

a number sentence where one thing is equal to something else.

#### equilateral triangle

has 3 equal sides and 3 equal angles. #### equivalent fractions

fractions written with different denominators, but with the same value

• 1/2 and 3/6 are equivalent fractions

#### even numbers

which are exactly divisible by 2

Even numbers finishes with a 0, 2, 4, 6, or 8

#### faces

flat part of a solid 3D shape.

#### factor

a whole number which divides exactly into another number, for example the factors of 8 are 1, 2, 4 and 8

#### fraction

A number that names part of a whole or part of a group

for example

• 1 out of 4 is a quarter (1/4)

#### graph

a visual way of displaying data; it can have bars, lines or pictures representing the data.

#### greater than (>)

sign meaning ‘is greater than’

#### highest common factor (HCF)

The HCF of a set of numbers is the largest number that is a factor of all numbers in the set.

#### improper fraction

a top-heavy fraction where the numerator is larger than the denominator

#### isosceles triangle

triangle with 2 equal sides and 2 equal angles

#### less than (<)

sign meaning ‘is greater than’

#### lowest common multiple (LCM)

the LCM of a set of numbers is the smallest number that is a multiple of all numbers in the set.

#### map scale

A ratio that compares the distance on a map with the actual distance #### mean

the average value of a set of numbers, found by adding up all of the values and dividing by the number of values

#### median

the mid-point of a set of data when the numbers are put in order of size

#### minimum

the lowest value mode the most common value in a set of data

#### mixed number

a mixture of a whole number and a fraction.

#### mode

the number in a set of data that comes up most

#### multiple

A number that is the product of a given number and a whole number

Example:

• To find the multiples of any number, multiply the number by the counting numbers 1, 2, 3, 4, and so on.
• The first six multiples of 4 are 4, 8, 12, 16, 20, 24.

#### negative integer or negative number

Number less than 0

#### net

An arrangement of two-dimensional figures that fold to form a three-dimensional figure #### numerator

The top part of a fraction

#### numerical expression

A mathematical phrase that includes only numbers and operation symbols

Examples:

• 30 + 34
• 84 ÷ 7
• 34 – 3

#### obtuse angle

An angle whose measure is greater than 90° and less than 180°

#### obtuse triangle

A triangle that has one obtuse angle #### parallelogram

a quadrilateral whose opposite sides are parallel and congruent #### percentage

a proportion when stated out of 100  and mark with % symbol

#### perimeter

the distance around the edge of a 2-D shape

#### perpendicular lines

Lines that intersect to form 90° angles, or right angles #### pie chart

a circle where sectors are marked with their areas representing the proportion of that part of a group of categories

#### prime

a number that only has two factors, 1 and itself

the first prime numbers are : 2, 3, 5, 7, 11, 13, 17, 19, 23….

#### prism

a 3-D solid with two identical faces parallel and joined by parallelograms, which are at right angles to the end faces in a right- angled (right) prism

#### product

The answer in a multiplication problem

• 6 x 3 = 18 18 is the product of 6 times 3
• 18 is the product of 6 times 3

a 2-D polygon with four sides and four angles

#### quarter

one-fourth of a whole or 1/4

the length of a straight line from the centre of a circle to the circumference

#### range

the difference between the largest and the smallest value in a set of numbers

Example

• number set : 2, 10, 8, 7, 11
• Range is: 11 – 2 = 9

#### ratio

A comparison of two numbers or quantities

Example:

• 3 to 5
• 3:5
• or 3/5

#### rectangle

a quadrilateral with opposite pairs of sides parallel and of equal lengths and all 4 angles are right angles

#### remainder

the number left over when one number doesn’t divide exactly into another.

#### reflex angle

an angle greater than 180o

#### reflection

the figure formed by flipping a geometric figure over a line of reflection to obtain a mirror image an angle of 90o

#### right triangle

A triangle with exactly 1 right angle

#### rotation

turning a shape around a given point or centre of rotation, either clockwise or anticlockwise.

#### rotational symmetry

A figure has rotational symmetry when it can be rotated less than 360° around a central point, or point of rotation and still match the original figure #### Scalene triangle

A triangle with no congruent sides (all side lengths are different)

#### series (or sequence)

a set of numbers where there is a pattern determining the difference between each term of the series

#### simplest form

A fraction is in simplest form when the numerator and denominator have no common factors other than 1

#### symmetry

a shape has symmetry when it can be divided into two equal, mirror images.

#### tally chart

a method of recording data using short lines, one for each object or count, grouped into fives for easy addition

#### transformation

A movement that doesn’t change the size or shape of a figure is a rigid transformation. Save

#### translation

moving a shape right or left a given number of squares and up or down a given number ot squares. #### Venn diagram

A display which shows relationships among sets by using ovals or other shapes to represent individual sets #### vertex (plural =vertices)

• the point where two or more rays meet
• the point of intersection of two sides of a polygon
• the point of intersection of three or more edges of a solid figure
• the top point of a cone #### volume

the amount of space within a solid shape

#### x-axis

the name given to the horizontal line going across a graph

#### y-axis

the name given to the vertical line going along a graph

#### <

sign meaning ‘is less than’

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