Math Terminology - Grade 6/7

Front 1

numerator

Back 1

The top number of a fraction. It tells the number of parts of the whole in the fraction

Front 2

octogon

Back 2

a polygon with eight sides

Front 3

odd numbers

Back 3

numbers which end in 1, 3, 5, 7, 9

Front 4

palindromic numbers

Back 4

numbers which read the same backwards and forwards eg 3443

Front 5

parallelogram

Back 5

a quadrilateral in which opposite sides are parallel and equal, and opposite angles are equal

Front 6

pentagon

Back 6

a polygon with five sides

Front 7

percent %

Back 7

out of one hundred

Front 8

perimeter

Back 8

the distance around the outside of a shape; the boundary

Front 9

perpendicular

Back 9

perpedicular lines meet at right angles

Front 10

pm (post meridiem)

Back 10

any time between midday and midnight

Front 11

polygon

Back 11

a plane shape wiht three or more straight sides such as a triangle, a quadrilateral, an pentagon etc

Front 12

prime number

Back 12

a number divisible only by itself and 1. It has only two factors, examples: 2, 17

Front 13

prism

Back 13

a solid shape with a uniform cross-section. Apart from identical ends, all other faces are rectangles

Front 14

pyramid

Back 14

a solid shape that has a polygon for a base and triangles for all other faces

Front 15

quadrant

Back 15

a quadrant is one-quarter of a circle

Front 16

quadrilateral

Back 16

a plane shape with four straight sides

Front 17

radius

Back 17

a radius is the distance from the centre of a circle to any point on the circumference

Front 18

rectangle

Back 18

a quadrilateral with four right angles and two pairs of equal and parallel sides

Front 19

regular polygon

Back 19

a polygon in which all angles are equal in size and all sides are equal in length

Front 20

rhombus

Back 20

a parallelogram in which all sides are equal in lenght and opposite angles are of an equal side

Front 21

solid

Back 21

the term used to describe a three-dimensional shape

Front 22

square

Back 22

a quadrilateral that has four equal sides and four right angles

Front 23

square centimetres

Back 23

(cm2) - a unit for measuring small areas

Front 24

square kilometre

Back 24

(km2) - a unit for measuring large areas
1km2 = 100ha

Front 25

square metre

Back 25

(m2) - a unit for measuring area

Front 26

square number

Back 26

the product obtained with a number is multiplied by itself - eg 2 x 2 = 4

Front 27

surface

Back 27

the outside layer of a solid shape - a surface can be flat or curved

Front 28

tally

Back 28

to keep count by making a mark to represent each item. To make counting easy, the marks are drawn in groups of five with the fifth mark crossing the four preceding strokes

Front 29

tangram

Back 29

a seven piece Chinese puzzle

Front 30

tessellation

Back 30

a pattern of identical shapes that fit together without gaps or overlaps

Front 31

tonne

Back 31

a unit of mass equal to one thousand kilograms
1 tonne = 1000kg

Front 32

trapezium

Back 32

a quadrilateral that has one pair of parallel sides

Front 33

triangular number

Back 33

a number that can be represented by dots in the shape of a triangle

Front 34

turning symmetry

Back 34

a shape that has turning symmetry if a tracing of the shape matches it after the tracing is rotated

Front 35

twenty-four hour time

Back 35

a method of measuring time what displays time divided into twenty-four hours to avoid confusion between am and pm

Front 36

vertex (plural: vertices)

Back 36

a point at which two or more lines meet to form a corner on a plane or solid shape

Front 37

vertical

Back 37

at right angles (perpendicular) to the horizon

Front 38

volume

Back 38

the amount of space occupied by a solid