Year 9 Key Words

Algebra 1 and 2

AdditionSumTotal

SubtractionDifference

Number lineProduct

Times-tableMultiplication

SequenceTerm-to-term rule

InputOutputRule

AlgebraExpressionFunctionX-axisY-axis

EquationLines

Plotting

Number 1

Equivalent

Unitary method

Mixed number

Generalise

Top heavy

Deduce

Improper

Bracket

Cancelling

Nested brackets

Compound interest

Approximate

Multiplier

Place valueCompare

Decimal number Significant

Decimal fraction Integer

Less than Ratio

Greater than Simplest form

Numerator ProportionDenominator

InverseConvert

Reverse percentage

Number 2

Inverse operation Significant figure

RoundingProduct

ApproximationDisplay

Decimal place Strategy

Pi Strict inequalityMemory keys

Recurring decimalBrackets

Terminating decimalStandard formUpper boundLower bound

Algebra 3

IntersectionSquare root

Trial and improvementFunctionSubject

Simultaneous Inequality

Elimination Inequation

Substitution Directly proportional

Denominator Linear

CancellingEquation

Co – efficientSolve

VariableSolution

FormulaExpression

Identity

Algebra 4

MultipleSquare root Factor Cube rootSquare

Prime numberCube

Prime factorGradient

SpeedPower Acceleration

IndexAxis

QuadraticIntercept

Cubic

Algebra 5 ExpansionSimplify

Co – ordinatesParallel

DimensionFactorisation

QuadraticLinear

Geometry and Measures 1

CorrespondingParallelTriangle

QuadrilateralVertex

Mid – pointPolygon

ArcChord

CircumferenceLoci

RegionCongruent

Congruence

DiameterSector

SegmentInscribed

HypotenusePythagoras theorem

ChordAngle bisector

RadiusPerpendicular bisector

Equi distant Tessellate

LocusAlternateTangent

Geometry and Measure 2

DiameterSurface area

PiSimilarDensityPressureSpeedArea Litre

Base Volume

Perpendicular height Co – ordinate

Parallelogram Line segment

Capacity Mid- point

CuboidHectare

Circumference Radius

Cross – section

Geometry and Measure 3

PlaneSymmetryCongruent

CongruencyObject

Angle of depressionImage

Angle of elevationCentre of enlargement

Tangent (tan)Scale factor

Cosine (cos)Fractional enlargement

Sine (sin)

Geometry and Measures 4

VolumeCircumference

GeneralisePlane of symmetry

AreaInvestigatePerimeter

Reflection symmetrySurface area

Rotational symmetry

Statistics 1

Line of best fit Quartile

Interpret Interquartile range

Time seriesGrouped dataRaw data

MeanTwo way tables

MedianTally Bias

Frequency Pie chartCriticise

PictogramBar chart

DistributionScatter graph

Cumulative frequency Correlation

Upper class boundaryRelationship

Mid – class valueData

QuestionnaireCensus

Statistics 2 Probability

Probability scaleRandom

Repeated experimentDifferent outcomes

FairBiasTrials

Estimate

CertainChance

Even chanceEqually likely

EventOutcome

FairLikely

PossibleImpossible

Statistics 3

Continuous dataSample size

Frequency tableMode Mean

MedianExtreme value

Appropriate dataCentral value

Bar chartLine graph

Frequency diagramTime-series graph

Stem-and-leaf diagramSurvey

QuestionnaireExperimentStatistics

Grouped dataClass interval

TallyFrequency

Data-collection sheetDatabaseSample

Primary sourceSecondary source

Data logTwo-way table

Discrete