12-hour clock a system of measuring time in terms of a repeating period of 12 hours 24-hour clock

square-based pyramid a solid with a square base and four triangular faces
statistic a value calculated from a set of data
straight line a line that is not curved
substitute replace part of an expression, usually a letter, by another value, usually
a number
surface area the area of the faces of a solid or 3D shape
symmetrical has at least one line of symmetry, or rotational symmetry of order two or more
term an individual number in a sequence
term-to-term rule a rule to find a term of a sequence, given the previous term
terminating ending; a terminating decimal has a finite number of decimal places, it does not go on for ever
theoretical probability a probability found using equally likely outcomes
time a way of putting events in order or measuring their duration
tonne (t) one thousand kilograms
top-heavy fraction common term for animproper fraction
transformation movement of a shape by reflection,
translate transform a shape, resulting in each part of the shape being moved the same distance in the same direction
translation see translate
transversal a line that crosses two or more parallel lines
trapezium quadrilateral with one pair of sides parallel
triangular prism a solid whose two ends, and its cross-sections, are identical and parallel triangles
triangular-based pyramid a solid with four triangular faces
unitary method solving direct proportion problems by first calculating the value of a
single item
unknown a letter (or letters) in an equation, for which the value (or values)is yet to be found
unlikely less than an even chance
variable a symbol, usually a letter, that can represent any one of a set of values
vertex a point where edges of a 2D or 3D shape meet
vertically opposite angle two of the four angles formed when two lines cross; they do not
have a common side
vertices plural of vertex
very likely a high change of happening
very unlikely a small chance of happening
volume the space occupied by a solid or 3D shape
whole number the numbers 0, 1, 2, 3, 4, …,
x-axis the horizontal axis on a grid
y-axis the vertical axis on a grid