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This document consists of 11 printed pages and 1 blank page. IB17 05_1112_02/6RP © UCLES 2017 [Turn over Cambridge International Examinations Cambridge Secondary 1 Checkpoint MATHEMATICS 1112/02 Paper 2 April 2017 MARK SCHEME Maximum Mark: 50 IMPORTANT NOTICE Mark Schemes have been issued on the basis of one copy per Assistant examiner and two copies per Team Leader. 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 Markers were instructed to award marks. It does not indicate the details of the discussions that took place at an Markers’ 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 will not enter into discussions about these mark schemes.

1112/02 Checkpoint Secondary 1 – Mark Scheme April 2017 Published Page 2 of 12 Mark scheme annotations and abbreviations M1 method mark A1 accuracy mark B1 independent mark FT follow through after error dep dependent oe or equivalent cao correct answer only isw ignore subsequent working soi seen or implied

1112/02 Checkpoint Secondary 1 – Mark Scheme April 2017 Published Page 3 of 12 Question Answer Marks Further Information 1 1 Question Answer Marks Further Information 2(a) 4t – 20 1 2(b) (w =) 45 1 Question Answer Marks Further Information 3(a) 150 1 3(b) 90 1 4 3 107 85 20 13 3 2 106

1112/02 Checkpoint Secondary 1 – Mark Scheme April 2017 Published Page 4 of 12 Question Answer Marks Further Information 4 14 and 6 2 Allow them in reverse order for 2 marks. Recognition that joined width is counted twice, e.g.:  2 × 40 – 68 oe  2x + y = 34 (where x and y can be any letters)  4x + 2y = 68  : < 6 – 8 4 6 or One of 14 or 6 given as either the length or the width. M1 Question Answer Marks Further Information 5 69.6 (%) cao 2 6

1112/02 Checkpoint Secondary 1 – Mark Scheme April 2017 Published Page 5 of 12 Question Answer Marks Further Information 7 ($)60 1 Question Answer Marks Further Information 8(a) Boys Girls Total Play instrument 31 60 91 Do not play instrument 9 20 29 Total 40 80 120 2 Three or more cells filled in correctly. B1 8(b) gives the percentages girls 75 (%) and boys 77.5 (%) and Ticks No 2 Follow through percentages from their table. Follow through decision from their correctly calculated percentages. One correct percentage seen B1 Follow through percentage from their table. Question Answer Marks Further Information 9 3.58… and 3.59… 1

1112/02 Checkpoint Secondary 1 – Mark Scheme April 2017 Published Page 6 of 12 Question Answer Marks Further Information 10 ($)4.70 and supportive working that includes sight of either 1075 (grams) or 1.075 (kg) or 0.98 (kg) or 980 (grams) with no further incorrect working. 2 ($)4.70 with no working or 1075 (grams) or 1.075 (kg) or Finding the correct cost for their mass. B1 Question Answer Marks Further Information 11 (0).09 (oe) 100 9 , 9% 2 0.28 0.15 0.3 1   implied by 0.27 or 1 – 0.73 or 0.09 M1 Question Answer Marks Further Information 12 11 : 5 2 Do not allow units in the ratio. 5 : 11 or any ratio equivalent to 11 : 5, e.g.  121 : 55 or 1.21 : 0.55  2.2 : 1 or 1: 0.45… B1

1112/02 Checkpoint Secondary 1 – Mark Scheme April 2017 Published Page 7 of 12 Question Answer Marks Further Information 13(a) –14 1 13(b) ( x =) 17 2 One correct trial x > 10 B1 13(c) x2 + x – 20 2 A correct expansion with at least 3 terms correct from x2 + 5 x – 4 x – 20 B1 Question Answer Marks Further Information 14 64 (km/h) 2 240 ÷ 3.75 (or equivalent) M1 Question Answer Marks Further Information 15(a) A suitable comment about the accuracy, e.g.  He has written too many digits.  He should have rounded his answer.  He shouldn’t have written all the digits from his calculator.  The times are only given to one decimal place.  It’s too accurate. 1 Do not accept, e.g.  Just ‘it’s not suitable’.  His answer should have been a whole number.  Just ‘his answer is accurate’.  His answer is right (or wrong). 15(b) 43.8 (seconds) 1 Condone 44, 43.84 or 43.843

1112/02 Checkpoint Secondary 1 – Mark Scheme April 2017 Published Page 8 of 12 Question Answer Marks Further Information 16(a) Four points plotted correctly on the scatter graph. i.e. 2 Do not allow with extra points. Two points correctly plotted. B1 Ignore extra points. 16(b) Negative (correlation) 1 Do not accept a description of the relationship. Question Answer Marks Further Information 17 5, 11, 21 1 All correct for 1 mark Question Answer Marks Further Information 18 22) ( x x (cm 2) or equivalent 1 70 60 50 40 8090 70 60 50 80 90 100

1112/02 Checkpoint Secondary 1 – Mark Scheme April 2017 Published Page 9 of 12 Question Answer Marks Further Information 19 71.6 (%) 2 Accept 72         2.502.50 4.29 or 2.50 1.79 or 0.716  2.504.29 or 1.716 or 171.6(%) M1 Question Answer Marks Further Information 20(a) 4.5 or equivalent 2 Correctly substituting 1 in place of x, e.g.  3(1) + 2y = 12  2 y = 9 M1 Substituting can be into their rearranged equation. 20(b) (4, 0) 1 20(c) A line passing through (1, 4.5) and (4, 0) 1 Follow through from answers to (a) and (b), provided there are different answers for each and the line passes through ( 1, their a) and ( their 4, 0) y x 8 7 6 5 4 3 2 1 0 –1 –2 –2 –1 1 2 3 4 5 6 7 8

1112/02 Checkpoint Secondary 1 – Mark Scheme April 2017 Published Page 10 of 12 Question Answer Marks Further Information 21 Number of sides in polygon Sum of the interior angles 5 540° 6 720° 9 1260(°) 2 Either correct. B1 Question Answer Marks Further Information 22 25 (km) 2 24 2 + 72 or better implied by 625 M1

1112/02 Checkpoint Secondary 1 – Mark Scheme April 2017 Published Page 11 of 12 Question Answer Marks Further Information 23 44.9(…) (m 2) 3 Accept an answer that rounds to either 44.9 or 45.0 Two of  22.5 π 2  or 6 9  < or 9.81 to 9.821…  23 π 2  or =  6 or 14.1 to 14.14…  6 × 3.5 or 21 Implied by e.g. 7.625 π (+ 21) or : 5  < (+ 21) or 23.9 to 23.96… or final answer of 45 M2 Allow figures rounded to 3 significant figures or better. π × k2, where k is 2.5 or 3 (could be implied by 6.25π or 19.6 to 19.64… or 9π or 28.26 to 28.3) or one of the calculations or values above. M1 Question Answer Marks Further Information 24 An explanation indicating that there are gaps, e.g  There shouldn’t be gaps  Mia has drawn a tessellation of a quadrilateral and a triangle 1

1112/02 Checkpoint Secondary 1 – Mark Scheme April 2017 Published Page 12 of 12 BLANK PAGE