year 8 maths

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Onlineresources• Auto-marked chapter pre-test• Video demonstrations of all workedexamples• Interactive widgets• Interactive walkthroughs• Downloadable HOTsheets• Access to all HOTmaths AustralianCurriculum courses• Access to the HOTmaths gameslibraryData collection,representation9and analysisWhat you will learn9A Types of data9B Dot plots and column graphs9C Line graphs9D Sector graphs and divided bar graphs9E Frequency distribution tables9F Frequency histograms and frequency polygons9G Mean, median, mode and range9H Interquartile range EXTENSION9I Stem-and-leaf plots9J Surveying and samplingCambridge Maths NSWStage 4 Year 8 Second editionISBN 978-1-108-46627-1 © Palmer et al. 2018Cambridge University PressPhotocopying is restricted under law and this material must not be transferred to another party.
NSW syllabusSTRAND: STATISTICS ANDSUBSTRANDS:PROBABILITYDATA COLLECTION ANDREPRESENTATIONSINGLE VARIABLEDATA ANALYSISOutcomesA student collects, represents andinterprets single sets of data, usingappropriate statistical displays.(MA4–19SP)A student analyses single sets of datausing measures of location and range.(MA4–20SP)© NESA, 2012Search engine statisticsSearch engines such as Google not only find web pages but also analyse and categorisesearches. If the entire world’s Google searches for one month (thousands of millions) werelisted in a single document it would be an incredible list filling millions of pages, but itwould be difficult to make conclusions about such a vast amount of data.Search engines employ computer software engineers who are also highly skilled inmathematics, especially in statistics. In the case of Google, they organise worldwidesearches into categories and present comparisons using graphs. This provides muchmore interesting and useful information for groups such as online shops, politicians,the entertainment industry, radio and TV stations, restaurants, airline companies andprofessional sports groups.Using ‘Google Insights for Search’, graphical comparisons can be made between thefrequencies of various types of searches within any country, state or city in the world. Forexample, which topics are of more interest (e.g. sport or news)? On which weekdays isshopping of more interest than sport? Which Australian state had the most searches abouttravel in the past year? Which Australian city has the highest percentage of people who buybooks online? This information can be quite helpful for businesses wanting to know whotheir target audiences are.In this chapter you will develop skills for organising data into categories, graphs andsummaries so that useful comparisons can be made and future trends determined.Cambridge Maths NSWStage 4 Year 8 Second editionISBN 978-1-108-46627-1 © Palmer et al. 2018Cambridge University PressPhotocopying is restricted under law and this material must not be transferred to another party.
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8YEARCambridgeMATHSNSWSTAGE 4SECOND
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iiiTable of ContentsAbout the autho
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vPuzzles and challenges 264Review:
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vii9Data collection, representation
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ixIntroduction and guide to this bo
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xiGuide to this bookFeatures:NSW Sy
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xiiiOverview of the digital resourc
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xvDownloadable PDF TextbookThe conv
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xviiAcknowledgementsThe author and
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NSW syllabusSTRAND: NUMBER AND ALGE
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1AThe language of algebra51A The la
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1AThe language of algebra7Exercise
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1AThe language of algebra911 A plum
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1BSubstitution and equivalence11Exa
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1BSubstitution and equivalence13PRO
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1C Adding and subtracting terms 15E
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1C Adding and subtracting terms 171
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1DMultiplying and dividing terms19b
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1DMultiplying and dividing terms211
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1EAdding and subtracting algebraic
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1EAdding and subtracting algebraic
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1FMultiplying and dividing algebrai
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1FMultiplying and dividing algebrai
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1GExpanding brackets311G Expanding
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1GExpanding brackets333 Consider th
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1GExpanding brackets3516 Prove that
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1HFactorising expressions37Example
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1HFactorising expressions3913 Consi
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1IApplying algebra41Exercise 1IUNDE
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1IApplying algebra4313 Roberto draw
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1JIndex laws for multiplication and
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1JIndex laws for multiplication and
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1KThe zero index and power of a pow
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1KThe zero index and power of a pow
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Investigation536 Draw a number pyra
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Chapter summary55Pronumeral: a lett
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Chapter review57Multiple-choice que
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Chapter review59Extended-response q
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2AReviewing equations632A Reviewing
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2AReviewing equations65Example 3Wri
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2AReviewing equations6715 a Explain
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2BEquivalent equations69Example 4 F
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2BEquivalent equations71Example 5bE
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2CEquations with fractions732C Equa
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2CEquations with fractions75Example
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2CEquations with fractions7710 To s
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2DEquations with pronumerals on bot
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2DEquations with pronumerals on bot
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2EEquations with brackets832E Equat
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2EEquations with brackets853 Rolf i
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2FSolving simple quadratic equation
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2FSolving simple quadratic equation
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2GFormulas and relationships91Examp
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2GFormulas and relationships9312 Th
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2HApplications952H ApplicationsEXTE
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2HApplications97Exercise 2HEXTENSIO
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2HApplications9914 The average of t
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2IInequalities101Example 15Represen
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2IInequalities10310 At a certain sc
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2JSolving inequalities105Example 17
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2JSolving inequalities107PROBLEM-SO
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Investigation109Tiling a pool edgeT
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Puzzles and challenges1111 Find the
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Chapter review113Multiple-choice qu
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Chapter review11510 a The sum of th
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NSW syllabusSTRAND: MEASUREMENT AND
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3ALength and perimeter1193A Length
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3ALength and perimeter121Exercise 3
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3ALength and perimeter12311 Gillian
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3BCircumference of circles1253B Cir
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3BCircumference of circles127Exerci
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3BCircumference of circles12917 We
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3CArea131• Triangle A = 1 2 × b
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3CArea133c i How many m 2 in 1 km 2
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3CArea13513 Write down expressions
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3DArea of special quadrilaterals137
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3DArea of special quadrilaterals139
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3EArea of circles141■ The ratio o
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1 d3EArea of circles143Example 115
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3FArea of sectors and composite fig
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3GSurface area of prisms151Example
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3GSurface area of prisms1538 Find t
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3HVolume and capacity155■ Some co
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3HVolume and capacity157PROBLEM-SOL
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3IVolume of prisms and cylinders159
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3JTime165■ The Earth is divided i
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3JTime1671 2 3 4 5 6 7 8 9 10 11 12
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3JTime1692 Find the number of:a sec
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3JTime17117 A doctor earns $180 000
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3KIntroducing Pythagoras’ theorem
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3KIntroducing Pythagoras’ theorem
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3LUsing Pythagoras’ theorem1773L
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3LUsing Pythagoras’ theorem179Exe
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3MCalculating the length of a short
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Investigation187Pythagorean triads
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Chapter summary189PerimeterTriangle
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Chapter review191Short-answer quest
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Chapter review193Extended-response
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4AEquivalent fractions1974A Equival
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4AEquivalent fractions199Example 1G
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4AEquivalent fractions201Example 29
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4BComputation with fractions2034B C
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4BComputation with fractions205■
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4BComputation with fractions207Exam
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4BComputation with fractions209Exam
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4CDecimal place value and fraction/
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4DComputation with decimals2174D Co
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4DComputation with decimals219Examp
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4DComputation with decimals221Examp
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4ETerminating decimals, recurring d
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4FConverting fractions, decimals an
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4GFinding a percentage and expressi
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4HDecreasing and increasing by a pe
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4IThe Goods and Services Tax (GST)2
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4IThe Goods and Services Tax (GST)2
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4JCalculating percentage change, pr
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4KSolving percentage problems with
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4KSolving percentage problems with
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Investigation263Calculating phiPhi
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Chapter summary2652=3Numerator2 par
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Chapter summary267Fraction to perce
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Chapter review2693 Evaluate each of
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Chapter review271Extended-response
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5AIntroducing ratios2755A Introduci
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5AIntroducing ratios277Exercise 5AU
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5AIntroducing ratios279ENRICHMENT-
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5BSimplifying ratios281■ The quan
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5BSimplifying ratios283Example 4bEx
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5CDividing a quantity in a given ra
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5DScale drawings2915D Scale drawing
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5DScale drawings293Example 9Convert
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5DScale drawings295Example 10Exampl
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5DScale drawings29717 A cartographe
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5EIntroducing rates299Example 12Wri
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5EIntroducing rates30111 The Tungam
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5FRatios and rates and the unitary
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5FRatios and rates and the unitary
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5GSolving rate problems3075G Solvin
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5GSolving rate problems309Exercise
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5GSolving rate problems311ENRICHMEN
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5HSpeed313Example 20Finding average
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5HSpeed315Exercise 5HUNDERSTANDING
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5HSpeed317ENRICHMENT- -20Speed rese
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5IDistance-time graphs319■ To dra
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5IDistance-time graphs321Exercise 5
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5IDistance-time graphs323Example 25
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5IDistance-time graphs32511 This di
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5IDistance-time graphs327ENRICHMENT
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Puzzles and challenges3291 This dia
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Chapter summary331Average rates720
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Chapter review33311 A toddler walke
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Chapter review33516 This distance-t
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Semester review 1 3378 For the rect
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Semester review 1 339Chapter 3: Mea
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Semester review 1 3418 Find the val
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Semester review 1 3439 a Increase $
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Semester review 1 3452 The training
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NSW syllabusSTRAND: MEASUREMENT AND
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6AThe language, notation and conven
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6BTransversal lines and parallel li
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6CTriangles365■ Triangles classif
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6CTriangles367Example 3a4 Use the a
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6CTriangles36911 A triangle is cons
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6DQuadrilaterals3716D Quadrilateral
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6DQuadrilaterals373Example 5Using t
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6DQuadrilaterals375Example 5b4 Use
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6EPolygons3776E PolygonsEXTENSIONTh
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6EPolygons379Example 7Finding angle
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6EPolygons381ef16°40°85°x°x°10
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6FLine symmetry and rotational symm
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6FLine symmetry and rotational symm
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6GEuler’s formula for three-dimen
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6GEuler’s formula for three-dimen
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Investigation391ConstructionsGeomet
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Puzzles and challenges3931 This sha
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Chapter review3975 These triangles
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7AThe Cartesian plane4017A The Cart
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7AThe Cartesian plane4033 Write the
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7BUsing rules, tables and graphs to
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7BUsing rules, tables and graphs to
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7CFinding the rule using a table of
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7DGradient4157D GradientEXTENSIONTh
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7DGradient417Exercise 7DEXTENSIONUN
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7DGradient419PROBLEM-SOLVING AND RE
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7EGradient-intercept form4217E Grad
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7EGradient-intercept form423Example
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7EGradient-intercept form425Example
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7EGradient-intercept form42713 Writ
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7FThe x-intercept429Example 11Findi
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7FThe x-intercept431PROBLEM-SOLVING
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7GSolving linear equations using gr
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7HApplying linear graphs4417H Apply
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7HApplying linear graphs443Example
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7HApplying linear graphs445PROBLEM-
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7INon-linear graphs447Example 17Plo
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7INon-linear graphs449c y = 5 − x
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7INon-linear graphs4516 What are th
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Investigation453Exploring families
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Chapter summary455yy = 2x − 1−4
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Chapter review4599 a Use the approp
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NSW syllabusSTRANDS: NUMBER AND ALG
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8AReflection4638A Re flectionWhen a
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8AReflection465Example 2Using coord
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8AReflection467Example 25 State the
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Page 487 and 488: 8BTranslation471Example 3Finding th
Page 489 and 490: 8BTranslation473Example 46 Copy the
Page 491 and 492: 8CRotation4758C Ro t a t ionWhen th
Page 493 and 494: 8CRotation477Exercise 8CUNDERSTANDI
Page 495 and 496: 8CRotation4797 The triangle shown h
Page 497 and 498: 8DCongruent figures4818D Congruent
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Page 503 and 504: 8ECongruent triangles487■ There a
Page 505 and 506: 8ECongruent triangles489Example 83
Page 507 and 508: 8ECongruent triangles4918 Two adjoi
Page 509 and 510: 8FSimilar figures4938F Similar figu
Page 511 and 512: 8FSimilar figures495Example 10Decid
Page 513 and 514: 8FSimilar figures4973 Decide if the
Page 515 and 516: 8FSimilar figures49911 a If a regul
Page 517 and 518: 8GSimilar triangles501• The hypot
Page 519 and 520: 8GSimilar triangles503Example 113 D
Page 521 and 522: 8GSimilar triangles5058 Trees on a
Page 523 and 524: 8HUsing congruent triangles to esta
Page 529 and 530: Investigation513Exploring SSAWith t
Page 531 and 532: Chapter summary515TranslationVector
Page 533 and 534: Chapter review51710 ABCD is a paral
Page 535: Chapter review51911 This quadrilate
Page 539 and 540: 9ATypes of data5239A Types of dataP
Page 541 and 542: 9ATypes of data525Example 12 Classi
Page 543 and 544: 9ATypes of data52710 A Likert-type
Page 545 and 546: 9BDot plots and column graphs5299B
Page 547 and 548: 9BDot plots and column graphs531Exa
Page 549 and 550: 9BDot plots and column graphs533Exa
Page 551 and 552: 9BDot plots and column graphs5357 E
Page 553 and 554: 9BDot plots and column graphs53712
Page 555 and 556: 9CLine graphs5399C Line graphsA lin
Page 557 and 558: 9CLine graphs541Exercise 9CUNDERSTA
Page 559 and 560: 9CLine graphs5439 The temperature i
Page 561 and 562: 9DSector graphs and divided bar gra
Page 567 and 568: 9EFrequency distribution tables5519
Page 573 and 574: 9FFrequency histograms and frequenc
Page 581 and 582: 9GMean, median, mode and range565fo
Page 583 and 584: 9GMean, median, mode and range5677
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9HInterquartile range5715 Calculate
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9IStem-and-leaf plots5739I Stem-and
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9IStem-and-leaf plots575Exercise 9I
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9IStem-and-leaf plots57711 A group
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9JSurveying and sampling5799J Surve
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9JSurveying and sampling581Example
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9JSurveying and sampling58312 Whene
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Puzzles and challenges5851 Six numb
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Chapter review59110 120 people were
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Semester review 2 5932 Find the val
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Semester review 2 5952 a Complete t
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Semester review 2 5973 Triangle ABC
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Semester review 2 5997 A set of six
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60118 a Multiplication is commutati
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60315 a 1836 b 1836c i 154 ii 352 i
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6052 a xy − x2b 33 m 2 c 2x + 2y
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6075 a u = 6 b j = 3 c p = 6 d m =
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g609Exercise 2J1 a true b true c fa
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61112 a A = 4 triangle areasExercis
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613Exercise 3K1 a 9 b 25 c 144 d 2.
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6159 a 1 3e 1 45i310 a 1 4e 5 4b 1
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61712 A13 aFraction Decimal %142434
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61916Raw material $110 (includes th
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6219 a 2 : 5 b 14 : 1 c 3 : 25 d 1
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623Exercise 5H6 a segments B and D
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625Puzzles and challenges1 a 2 b 3
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6278 a 5.6 b 11.76 c 85.5 m d $1.98
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62911 a Isosceles, the two radii ar
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631Short-answer questions1 a 50 b 6
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633iiyey321−3 −2 −1O−11 2 3
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63510 a y = 2x + 3 b y = − 1 2 x
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6374 a x = 2 b x = 0.5 c x = 3d x =
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63910 a d = 15t b 3 hoursc 3 hours
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641b8642−3 −2 −1O−2−4−6
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643ef13 They are on the mirror line
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6454 a i E ii Hb i EHc i ∠Gii GHi
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64710 a ∠A = ∠D (corresponding
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6494 a discrete numericalb continuo
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651Exercise 9C1 a 3 kg b 4 kg c 5 k
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653Exercise 9E1 a true b false c tr
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65511 aSurvey locationHeightgraph (
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6574 a Yes, it is required informat
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659Linear relationships 1Multiple-c
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661acute angles 350, 365adding frac
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663surface area 150survey 579tally
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