Cambridge IGCSE Mathematics - International 0607 — 2025 Oct/Nov Paper 6 · Variant 2

This document has 12 pages. Any blank pages are indicated. [Turn over Cambridge IGCSE™ CAMBRIDGE INTERNATIONAL MATHEMATICS 0607/62 Paper 6 Investigation and Modelling (Extended) October/November 2025 1 hour 30 minutes You must answer on the question paper. No additional materials are needed. INSTRUCTIONS ● Answer all questions. ● Use a black or dark blue pen. You may use an HB pencil for any diagrams or graphs. ● Write your name, centre number and candidate number in the boxes at the top of the page. ● Write your answer to each question in the space provided. ● Do not use an erasable pen or correction fluid. ● Do not write on any bar codes. ● You should use a graphic display calculator where appropriate. ● You may use tracing paper. ● You must show all necessary working clearly, including sketches, to gain full marks for correct methods. ● In this paper you will be awarded marks for providing full reasons, examples and steps in your working to communicate your mathematics clearly and precisely. INFORMATION ● The total mark for this paper is 50. ● The number of marks for each question or part question is shown in brackets [ ]. * 9 5 1 8 4 2 9 8 8 5 * DC (PQ/FC) 345053/1 © UCLES 2025 ,










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2 0607/62/O/N/25 © UCLES 2025 Section A INVESTIGATION SQUARE PATTERNS You are advised to spend no more than 45 minutes on this section. In this investigation you will look at the number of lines used to draw square patterns. This is Pattern 1. is a vertical line and is a horizontal line. There are 2 vertical lines. There are 2 horizontal lines. There are 4 lines in total. This is Pattern 2. There are 3 vertical lines. There are 4 horizontal lines. There are 7 lines in total. This is Pattern 3. 1 (a) Complete the table. Pattern number (n) Number of vertical lines Number of horizontal lines Total number of lines 1 2 2 4 2 3 4 7 3 4 5 [3] * 0000800000002 * ,










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3 0607/62/O/N/25 © UCLES 2025 [Turn over (b) Find an expression, in terms of n, for the total number of lines in Pattern n. … [3] (c) The total number of lines in a pattern is 754. Work out the number of horizontal lines in this pattern. … [3] * 0000800000003 * ,










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4 0607/62/O/N/25 © UCLES 2025 2 The square patterns in Question 1 make towers of squares. This is Tower 1. There are 2 vertical lines. There are 2 horizontal lines. There are 4 lines in total. This is Tower 2. There are 5 vertical lines. There are 6 horizontal lines. There are 11 lines in total. This is Tower 3. (a) Complete the table. Tower number (t) Number of vertical lines Number of horizontal lines Total number of lines 1 2 2 4 2 5 6 11 3 4 5 [4] * 0000800000004 * ,










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5 0607/62/O/N/25 © UCLES 2025 [Turn over (b) Find an expression, in terms of t, for the number of horizontal lines in Tower t. … [2] (c) This is an expression for the total number of lines in Tower t. . ( ) t t 0 5 3 5 + Use this expression and your answer from part (b) to find an expression for the number of vertical lines in Tower t. Give your answer in its simplest form. … [3] (d) A tower has 902 vertical lines. Find the total number of lines in the bottom row of squares in this tower. … [4] * 0000800000005 * ,










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6 0607/62/O/N/25 © UCLES 2025 (e) The total number of lines in Tower ( ) n 1 + is 175 more than the total number of lines in Tower n. Work out the value of n. … [3] * 0000800000006 * ,










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7 0607/62/O/N/25 © UCLES 2025 [Turn over The modelling task starts on the next page. * 0000800000007 * ,










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8 0607/62/O/N/25 © UCLES 2025 Section B MODELLING WASTE PLASTIC You are advised to spend no more than 45 minutes on this section. In this task you will look at how waste plastic is recycled or burned or discarded. 3 (a) Recycled waste plastic The table shows some information about the percentage of waste plastic that was recycled. Number of years after 1988 (x) 0 1 2 3 4 5 Percentage recycled (y) 2.0 2.7 (i) Each year after 1988 the percentage of waste plastic that was recycled increased by 0.7 . Complete the table. [2] (ii) A straight line models the data in the table. Find the equation of the model for y in terms of x. … [2] (b) Burned waste plastic The percentage of waste plastic that was burned also increased by 0.7 each year after 1988. In 1988 the percentage of waste plastic that was burned was 6.6 . y is now the percentage of waste plastic that was burned. x is still the number of years after 1988. Find the equation of the model for the percentage of waste plastic that was burned. … [1] (c) Describe fully the transformation that maps the graph of the model for recycled waste plastic onto the graph of the model for burned waste plastic. … [2] * 0000800000008 * ,










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9 0607/62/O/N/25 © UCLES 2025 [Turn over (d) Discarded waste plastic Waste plastic that is not recycled and is not burned is discarded. y is now the percentage of waste plastic that was discarded. x is still the number of years after 1988. (i) Show that the model for discarded waste plastic is . . y x 1 4 92 8 = - + . [2] (ii) Explain why the model is not valid when x 70 = . … [1] (e) Find the number of years after 1988 when the percentage of discarded waste plastic is 49.4 . Use the model in part (d)(i). … [2] (f) Find the year in which the percentage of recycled waste plastic becomes more than the percentage of discarded waste plastic. Use the models in part (a)(ii) and part (d)(i). … [5] * 0000800000009 * ,










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10 0607/62/O/N/25 © UCLES 2025 4 You will now look at the mass of macroplastics in the ocean. Macroplastics are large pieces of waste plastic. A model for the mass of macroplastics in the ocean is . . m t t 0 001595 6 399 6419 2 = - + . m is the mass of macroplastics in megatonnes ( ) kg 1 10 megatonne 9 = t is the year (a) In 2020, t 2020 = . Find the value of m in 2020. Write down all the figures in your answer. … [2] (b) On the axes, sketch the graph of the model for t 2020 2050 G G . 2020 2050 t m 0 [3] * 0000800000010 * ,










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11 0607/62/O/N/25 © UCLES 2025 (c) Use the model to find the number of years after 2020 that it takes for the mass of macroplastics to double. … [3] * 0000800000011 * ,









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12 0607/62/O/N/25 © UCLES 2025 Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where possible. Every reasonable effort has been made by the publisher (UCLES) to trace copyright holders, but if any items requiring clearance have unwittingly been included, the publisher will be pleased to make amends at the earliest possible opportunity. To avoid the issue of disclosure of answer-related information to candidates, all copyright acknowledgements are reproduced online in the Cambridge Assessment International Education Copyright Acknowledgements Booklet. This is produced for each series of examinations and is freely available to download at www.cambridgeinternational.org after the live examination series. Cambridge Assessment International Education is part of Cambridge Assessment. Cambridge Assessment is the brand name of the University of Cambridge Local Examinations Syndicate (UCLES), which is a department of the University of Cambridge. BLANK PAGE * 0000800000012 * ,









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This document consists of 10 printed pages. © Cambridge University Press & Assessment 2025 [Turn over Cambridge IGCSE™ CAMBRIDGE INTERNATIONAL MATHEMATICS 0607/62 Paper 6 (Extended) October/November 2025 MARK SCHEME Maximum Mark: 60 Published This mark scheme is published as an aid to teachers and candidates, to indicate the requirements of the examination. It shows the basis on which Examiners were instructed to award marks. It does not indicate the details of the discussions that took place at an Examiners’ meeting before marking began, which would have considered the acceptability of alternative answers. Mark schemes should be read in conjunction with the question paper and the Principal Examiner Report for Teachers. Cambridge International will not enter into discussions about these mark schemes. Cambridge International is publishing the mark schemes for the October/November 2025 series for most Cambridge IGCSE, Cambridge International A and AS Level components, and some Cambridge O Level components.

0607/62 Cambridge IGCSE – Mark Scheme PUBLISHED October/November 2025 © Cambridge University Press & Assessment 2025 Page 2 of 10 Generic Marking Principles These general marking principles must be applied by all examiners when marking candidate answers. They should be applied alongside the specific content of the mark scheme or generic level descriptions for a question. Each question paper and mark scheme will also comply with these marking principles. GENERIC MARKING PRINCIPLE 1: Marks must be awarded in line with: • the specific content of the mark scheme or the generic level descriptors for the question • the specific skills defined in the mark scheme or in the generic level descriptors for the question • the standard of response required by a candidate as exemplified by the standardisation scripts. GENERIC MARKING PRINCIPLE 2: Marks awarded are always whole marks (not half marks, or other fractions). GENERIC MARKING PRINCIPLE 3: Marks must be awarded positively: • marks are awarded for correct/valid answers, as defined in the mark scheme. However, credit is given for valid answers which go beyond the scope of the syllabus and mark scheme, referring to your Team Leader as appropriate • marks are awarded when candidates clearly demonstrate what they know and can do • marks are not deducted for errors • marks are not deducted for omissions • answers should only be judged on the quality of spelling, punctuation and grammar when these features are specifically assessed by the question as indicated by the mark scheme. The meaning, however, should be unambiguous. GENERIC MARKING PRINCIPLE 4: Rules must be applied consistently, e.g. in situations where candidates have not followed instructions or in the application of generic level descriptors. GENERIC MARKING PRINCIPLE 5: Marks should be awarded using the full range of marks defined in the mark scheme for the question (however; the use of the full mark range may be limited according to the quality of the candidate responses seen). GENERIC MARKING PRINCIPLE 6: Marks awarded are based solely on the requirements as defined in the mark scheme. Marks should not be awarded with grade thresholds or grade descriptors in mind.

0607/62 Cambridge IGCSE – Mark Scheme PUBLISHED October/November 2025 © Cambridge University Press & Assessment 2025 Page 3 of 10 Mathematics-Specific Marking Principles 1 Unless a particular method has been specified in the question, full marks may be awarded for any correct method. However, if a calculation is required then no marks will be awarded for a scale drawing. 2 Unless specified in the question, non-integer answers may be given as fractions, decimals or in standard form. Ignore superfluous zeros, provided that the degree of accuracy is not affected. 3 Allow alternative conventions for notation if used consistently throughout the paper, e.g. commas being used as decimal points. 4 Unless otherwise indicated, marks once gained cannot subsequently be lost, e.g. wrong working following a correct form of answer is ignored (isw). 5 Where a candidate has misread a number or sign in the question and used that value consistently throughout, provided that number does not alter the difficulty or the method required, award all marks earned and deduct just 1 A or B mark for the misread. 6 Recovery within working is allowed, e.g. a notation error in the working where the following line of working makes the candidate’s intent clear.

0607/62 Cambridge IGCSE – Mark Scheme PUBLISHED October/November 2025 © Cambridge University Press & Assessment 2025 Page 4 of 10 Annotations guidance for centres Examiners use a system of annotations as a shorthand for communicating their marking decisions to one another. Examiners are trained during the standardisation process on how and when to use annotations. The purpose of annotations is to inform the standardisation and monitoring processes and guide the supervising examiners when they are checking the work of examiners within their team. The meaning of annotations and how they are used is specific to each component and is understood by all examiners who mark the component. We publish annotations in our mark schemes to help centres understand the annotations they may see on copies of scripts. Note that there may not be a direct correlation between the number of annotations on a script and the mark awarded. Similarly, the use of an annotation may not be an indication of the quality of the response. The annotations listed below were available to examiners marking this component in this series. Annotations Annotation Meaning More information required Accuracy mark awarded zero Accuracy mark awarded one Accuracy mark awarded two Accuracy mark awarded three Independent mark awarded zero Independent mark awarded one Independent mark awarded two Independent mark awarded three Benefit of the doubt Communication mark Incorrect Follow through Highlighter Highlight a key point in the working Ignore subsequent work Method mark awarded zero Method mark awarded one Method mark awarded two

0607/62 Cambridge IGCSE – Mark Scheme PUBLISHED October/November 2025 © Cambridge University Press & Assessment 2025 Page 5 of 10 Annotation Meaning Method mark awarded three Misread Omission Off-page comment Allows comments to be entered at the bottom of the RM marking window and then displayed when the associated question item is navigated to. On-page comment Allows comments to be entered in speech bubbles on the candidate response. Premature rounding/approximation Special case Indicates that work/page has been seen Transcription error Correct Correct answer from incorrect working

0607/62 Cambridge IGCSE – Mark Scheme PUBLISHED October/November 2025 © Cambridge University Press & Assessment 2025 Page 6 of 10 MARK SCHEME NOTES The following notes are intended to aid interpretation of mark schemes in general, but individual mark schemes may include marks awarded for specific reasons outside the scope of these notes. Types of mark M Method marks, awarded for a valid method applied to the problem. A Accuracy mark, awarded for a correct answer or intermediate step correctly obtained. For accuracy marks to be given, the associated Method mark must be earned or implied. B Mark for a correct result or statement independent of Method marks. When a part of a question has two or more ‘method’ steps, the M marks are in principle independent unless the scheme specifically says otherwise; and similarly where there are several B marks allocated. The notation ‘dep’ is used to indicate that a particular M or B mark is dependent on an earlier mark in the scheme. Abbreviations awrt answers which round to cao correct answer only dep dependent FT follow through after error isw ignore subsequent working nfww not from wrong working oe or equivalent rot rounded or truncated SC Special Case soi seen or implied Question Answer Marks Partial Marks 1(a) Pattern number (n) Number of vertical lines Number of horizontal lines Total number of lines 3 4 6 10 4 5 8 13 5 6 10 16 3 B1 for each correct row 1(b) 3n + 1 or 1 + 3n oe 2 B1 for 3n + j oe or kn + 1 (k ≠ 0) three differences of 3 in total line column or in working C1

0607/62 Cambridge IGCSE – Mark Scheme PUBLISHED October/November 2025 © Cambridge University Press & Assessment 2025 Page 7 of 10 Question Answer Marks Partial Marks 1(c) 3n + 1 = 754 C1 FT their (3n + 1) 502 2 B1 for 251 or for correct solution to their equation provided their(3n + 1) is of, or would reduce to, the form an + b (a ≠ 1, b ≠ 0) OR B1 for 2 × their positive integer 251 2(a) Tower (t) Number of vertical lines Number of horizontal lines Total number of lines 3 9 12 21 4 14 20 34 5 20 30 50 3 B1 for each correct row Tower 4 (or Tower 5) drawn (may be a correct extension of Tower 3) or 9 + 12 or their 14 + their20 or their 20 + their30 or 3 differences from 3, 4, 5, 6 for vertical lines or 3 differences from 4, 6, 8, 10 for horizontal lines or 3 differences from 7, 10, 13, 16 for total C1 2(b) t2 + t or t(t +1) oe 2 B1 for a quadratic expression in t 2(c) 0.5t(t + 3) or t(0.5t + 1.5) or 0.5t2 + 1.5t final answer 2 B1 for 1.5t2 + 2.5t or – t2 – t or for –1.5t2 – 2.5t or – (1.5t2 + 2.5t) after reversed subtraction 0.5t(3t + 5) – (t2 + t) C1 FT their (t2 + t)

0607/62 Cambridge IGCSE – Mark Scheme PUBLISHED October/November 2025 © Cambridge University Press & Assessment 2025 Page 8 of 10 Question Answer Marks Partial Marks 2(d) Correct sketch of y = 0.5t2 + 1.5t oe and line drawn at y = 902 on sketch or 0.5t2 + 1.5t – 902 = 0 and 2 1.5 1.5 4 0.5 902 2 0.5 −  −  −  oe or table of 3 consecutive values from 39 40 41 42 819 860 902 945 or 0.5t2 + 1.5t – 902 = 0 and (t + 44)(t – 41) = 0 C2 FT their (0.5t2 + 1.5t) C1 FT for correct sketch of y = 0.5t2 + 1.5t oe or FT their (0.5t2 + 1.5t) 2 1.5 1.5 4 0.5 902 2 0.5 −  −  −  oe or FT their (0.5t2 + 1.5t) table of 2 consecutive values from 39 40 41 42 819 860 902 945 or FT their (0.5t2 + 1.5t) (t + 44)(t – 41) 124 2 B1 for 41 or 3 × their41 + 1 If 0 scored, SC C1 for their(0.5t2 + 1.5t) = 902 or their (0.5t2 + 1.5t) – 902 = 0 2(e) 3(n + 1) + 1 = 175 or 0.5(n + 1)(3(n + 1) + 5) – 0.5n(3n + 5) = 175 or Sketch of 2 graphs labelled correctly C1 Simplification to 3n + 4 = 175 oe or sketch showing intersection of 2 graphs at n = 57 C1 57 1 Alternative method 3N + 1 = 175 and [n =] 174 1 3 − or 58 – 1 C2 C1 for 3N + 1 = 175 or [n =] 174 1 3 − or 58 – 1 57 1

0607/62 Cambridge IGCSE – Mark Scheme PUBLISHED October/November 2025 © Cambridge University Press & Assessment 2025 Page 9 of 10 Question Answer Marks Partial Marks Modelling Waste Plastic 3(a)(i) Years (x years) 0 1 2 3 4 5 Percentage (y %) 0.6 1.3 2.0 2.7 3.4 4.1 2 B1 for two correct values 3(a)(ii) y = 0.7x + 0.6 oe final answer 2 FT their 0.6 from table B1 for 0.7x + their 0.6 oe or for y = kx + their 0.6 oe k ≠ 0 or y = 0.7x + k oe 3(b) y = 0.7x + 6.6 oe 1 3(c) Translation 0 6    2 B1 for each FT 6.6 – their 0.6 in 3(a)(ii) 3(d)(i) y = 100 – (0.7x + 0.6) – (0.7x + 6.6) oe leading to y = –1.4x + 92.8 2 B1FT for y = 100 – their(0.7x + 0.6) – their(0.7x + 6.6) with one sign error 3(d)(ii) negative oe 1 3(e) 31 1 Correctly isolates x term C1 3(f) their (0.7x + 0.6) > –1.4x + 92.8 or sketch of y = their (0.7x + 0.6) C1 their 0.7x + 1.4x > 92.8 – their 0.6 or sketch of y = –1.4x + 92.8 C1 FT isolation of x in their first equation 2031 or 2032 3 B2 for 43.9… or 43 or 44 soi or M1 for x > 92.8 0.6 0.7 1.4 − + their their or for point of intersection of appropriate sketches and B1 for their 43.9 added to 1988 4(a) [m = ] 0.001595(2020)2 – 6.399×2020 + 6419 C1 1.258 final answer 1

0607/62 Cambridge IGCSE – Mark Scheme PUBLISHED October/November 2025 © Cambridge University Press & Assessment 2025 Page 10 of 10 Question Answer Marks Partial Marks 4(b) Correct sketch 2 B2 for curve with continuously increasing positive gradient and • starting on m -axis above the t- axis and • reaching at least t = 2045 or B1 for curve with continuously increasing positive gradient and • starting on m -axis above the t- axis or • reaching at least t = 2045 Correct vertical scale indicated C1 4(c) Horizontal line at 2 × their 1.258 drawn on sketch or 0.001595t2 – 6.399t + 6419 = 2 × their 1.258 oe C1 17 or 18 or 17.35[5]…to 17.4 (years) 2 B1 for 2037 or 2038 or 2037.35… to 2037.4