CAMBRIDGEUNIVERSITY PRESSCambridge Lower SecondaryMathematicsLEARNER'S BOOK 9Lynn Byrd,Greg Byrd Chris PearceCambridge AssessmentSecond editionDigital AccessEndorsed for full syllabus coverageCAMBRIDGEUNIVERSITY PRESSCambridge Lower SecondaryMathematicsLEARNER'S BOOK 9Greg Byrd,Lynn Byrd and Chris PearceCAMBRIDGEUNIVERSITY PRESSUniversity Printing House,Cambridge CB2 8BS.United KingdomOne Liberty Plaza,20th Floor,New York,NY 10006,USA477 Williamstown Road,Port Melbourne,VIC 3207,Australia314-321,3rd Floor,Plot 3,Splendor Forum,Jasola District Centre,New Delhi -110025,India79 Anson Road,#06-04/06,Singapore 079906Cambridge University Press is part of the University of Cambridge.It furthers the University's mission by disseminating knowledge in the pursuit ofeducation,learning and research at the highest international levels of excellence.www.cambridge.orgInformation on this title:www.cambridge.org/9781108771436Cambridge University Press 2021This publication is in copyright.Subject to statutory exceptionno reproduction of any part may take place without the writtenpermission of Cambridge University PressFirst published 2014Second edition 2021212019181716151413121110987654321Printed in'country'by 'printerA catalogue record for this publication is available from the British LibraryISBN 978-1-108-77143-6 Paperback Digital Access(1 year)ISBN 978-1-108-xxxxx Digital Edition (1 year)ISBN 978-1-108-xxxxx eBookCambridge University Press has no responsibility for the persistence or accuracyof URLs for external or third-party internet websites referred to in this publication.and does not guarantee that any content on such websites is,or will remain,accurate or appropriate.Information regarding prices,travel timetables,and otherfactual information given in this work is correct at the time of first printing butCambridge University Press does not guarantee the accuracy of such informationthereafter.NOTICE TO TEACHERS IN THE UKIt is illegal to reproduce any part of this work in material form (includingphotocopying and electronic storage)except under the following circumstances:(i)where you are abiding by a licence granted to your school or institution by theCopyright Licensing Agency;where no such licence exists,or where you wish to exceed the terms of a licenceand you have gained the written permission of Cambridge University Press;(iii)where you are allowed to reproduce without permission under the provisionsof Chapter 3 of the Copyright,Designs and Patents Act 1988,which covers,forexample,the reproduction of short passages within certain types of educationalanthology and reproduction for the purposes of setting examination questions.Projects and their accompanying teacher guidance have been written by the NRICHTeam.NRICH is an innovative collaboration between the Faculties of Mathematicsand Education at the University of Cambridge,which focuses on problem solving andon creating opportunities for students to learn mathematics through exploration anddiscussion https://nrich.maths.org.