Mathitat
Serious maths,
gently done.
Glossary

Number

Common factorCommon multipleComposite numberCube numberCube rootDecimalDecimal placeDenominatorDifferenceDigitDivisibilityEquivalent fractionError intervalEven numberExponentFactorFactor pairFractionHighest common factor (HCF)Improper fractionIndexIntegerInverse operationIrrational numberLower boundLowest common multiple (LCM)Mixed numberMultipleNegative numberNumeratorOdd numberOperationOrder of operationsPercentagePlace valuePowerPrimePrime factorPrime factorisationProductQuotientRational numberRationaliseReciprocalRecurring decimalRemainderSignificant figureSquare numberSquare rootStandard formSumSurdTerminating decimalUpper bound

Algebra

Arithmetic sequenceAxisCoefficientCommon differenceComplete the squareComposite functionConstantCoordinateDifference of two squaresEquationEquation of a lineExpressionFormulaFunctionGeometric sequenceGradientIdentityInequalityInterceptInverse functionLike termsMidpointnth termOriginParabolaQuadraticQuadratic formulaRootSequenceSimultaneous equationsSolutionSubject of a formulaTermTurning pointVariable

Ratio & proportion

Best buyCompound interestCompound measureDensityDepreciationDirect proportionInverse proportionMultiplierPercentage changeProportionRateRatioSpeedUnitary method

Geometry & measures

Acute angleAlternate anglesAngleArcAreaBearingBisectorCapacityChordCircumferenceCo-interior anglesConeCongruentCorresponding anglesCosineCross-sectionCuboidCylinderDegreeDiagonalDiameterEnlargementEquilateral triangleExterior angleHypotenuseInterior angleIsosceles triangleLine of symmetryLocusMagnitudeMassObtuse angleParallelPerimeterPerpendicularPolygonPrismPyramidPythagoras' theoremQuadrilateralRadiusReflectionReflex angleRegular polygonRight angleRotationRotational symmetryScale factorScalene triangleSectorSegmentSimilarSineSphereSurface areaSymmetryTangentTransformationTranslationTrigonometryVectorVertexVertically opposite anglesVolume

Probability

BiasedComplementConditional probabilityEventExhaustiveExpected frequencyIndependent eventsIntersectionMutually exclusiveOutcomeProbabilityRelative frequencySample spaceTheoretical probabilityTree diagramUnionVenn diagram

Statistics

AverageBar chartClass intervalContinuous dataCorrelationCumulative frequencyDataDiscrete dataFrequencyFrequency densityFrequency polygonHistogramInterquartile rangeLine of best fitMeanMedianModal classModeOutlierPictogramPie chartPopulationPrimary dataQualitative dataQuantitative dataQuartileRangeSampleScatter graphSecondary dataStem-and-leaf diagramTallyTwo-way table

Command words

CalculateCompareCompleteConstructDescribeDetermineDrawEstimateEvaluateExpandExplainFactoriseFindGive a reasonIdentifyInterpretJustifyMeasurePlotProveRearrangeRoundShow thatSimplifySketchSolveStateSubstituteWork outWriteWrite down

General

AboutAltogetherAmountApproximatelyAssumeAt leastAt mostCombinedConsecutiveEachExploreGeneraliseIn terms ofMaximumMinimumModelOptimumPerPer annumRemainingRepresentRespectivelyShareSustainableTotalValue

Justify

Practise this

Back up your answer with working and/or a written reason.

In Español · sample
justificarRespalda tu respuesta con el procedimiento y/o una razón escrita.

I know ___ because ___.

Q Sam says 91 is a prime number. Justify why Sam is wrong.

A

91 = 7 × 13, so 91 has factors other than 1 and itself.

So 91 is not prime — the reason is the evidence, not just the answer.

Practise this

Browse all maths topics