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Mathematics Stage 8 V2© UCLES 2011 P110/MS/A/M/11 2 These tables give general guidelines on marking answers that involve number and place value, and units of length, mass, money or duration. If the mark scheme does not specify the correct answer, refer to these general guidelines. Number and Place value The table shows various general rules in terms of acceptable decimal answers. Accept Accept omission of leading zero if answer is clearly shown, e.g. .675 Accept tailing zeros, unless the question has asked for a specific number of decimal places, e.g. 0.7000 Always accept appropriate tailing zeros, e.g. 3.00 m; 5.000 kg Accept a comma as a decimal point if that is the convention that you have taught the children, e.g. 0,638 Units For questions involving quantities, e.g. length, mass, time or money, correct units must be given in the answer. The table shows acceptable and unacceptable versions of the answer 1.85 m. Correct answer Also accept Do not accept Units are not given on answer line and the question does not specify a unit for the answer 1.85 m Correct conversions provided the unit is stated, e.g. 1 m 85 cm 185 cm 1850 cm 1850 mm 0.00185 km 1.85 185 m If the unit is given on the answer line, e.g. ………………… m ……1.85…… m Correct conversions, provided the unit is stated unambiguously, e.g. ……185 cm…… m ……185…… m ……1850…… m etc. If the question states the unit that the answer should be given in, e.g. “Give your answer in metres” 1.85 m 1.85 1 m 85 cm 185; 1850 Any conversions to other units, e.g. 185 cm
© UCLES 2011 P110/MS/A/M/11 3 Money For questions involving money, it is essential that appropriate units are given in the answer. The table shows acceptable and unacceptable versions. Accept Do not accept If the amount is in dollars and cents, the answer should be given to two decimal places. $0.30 $9 or $9.00 $09 or $09.00 If units are not given on answer line Any unambiguous indication of the correct amount, e.g. 30 cents; 30 c $0.30; $0.30 c; $0.30 cents $0-30; $0=30; $00:30 30 or 0.30 without a unit Incorrect or ambiguous answers, e.g. $0.3; $30; $30 cents; 0.30 cents If $ is shown on the answer line $......0.30…… $......0.30 cents…… Accept all unambiguous indications, as shown above $......30…… $......30 cents…… (this cannot be accepted because it is ambiguous, but if the dollar sign is deleted it becomes acceptable) If cents is shown on the answer line ……30……cents ……$0.30……cents ……0.30……cents ……$30……cents Duration Accept any unambiguous method of showing duration and all reasonable abbreviations of hours (h, hr, hrs), minutes (m, min, mins) and seconds (s, sec, secs). Accept Do not accept Any unambiguous indication using any reasonable abbreviations of hours (h, hr, hrs), minutes (m, min, mins) and seconds (s, sec, secs), e.g. 2 hours 30 minutes; 2 h 30 m; 02 h 30 m 5 min 24 sec; 00 h 05 m 24 s Incorrect or ambiguous formats, e.g. 2.30; 2.3; 2.30 hours; 2.30 min; 2 h 3; 2.3 h Any correct conversion with appropriate units, e.g. 2.5 hours; 150 mins 324 seconds 2.5; 150 304 Also accept unambiguous digital stopwatch format, e.g. 02:30:00 00:05:24; 05:24 s Do not accept ambiguous indications, e.g. 02:30 5.24
© UCLES 2011 P110/MS/A/M/11 4 Time There are many ways to write times, in both numbers and words, and marks should be awarded for any unambiguous method. Accept time written in numbers or words unless there is a specific instruction in the question. Some examples are given in the table. Accept Do not accept Any unambiguous indication of correct answer in numbers, words or a combination of the two, e.g. 07:30; 19:00 0730; 07 30; 07.30; 07,30; 07-30; 7.30; 730 a.m.; 7.30am; 7.30 in the morning Half past seven (o’clock) in the morning Thirty minutes past seven am Also accept: O-seven-thirty 1900; 19 00; 19_00 etc. Nineteen hundred (hours) Seven o’clock in the afternoon/evening Accept correct conversion to 12-hour clock, e.g. 16:42 4.42 p.m. Sixteen forty two Four-forty-two in the afternoon/evening Four forty two p.m. Forty two (minutes) past four p.m. Eighteen (minutes) to five in the evening Also accept a combination of numbers and words, e.g. 18 minutes to 5 p.m. 42 minutes past 4 in the afternoon Incorrect or ambiguous formats, e.g. 07.3; 073; 07 3; 730; 73; 7.3; 7.3 am; 7.30 p.m 19; 190; 19 000; 19.00 am; 7.00 am 4.42 am; 0442; 4.42 Forty two (minutes) past sixteen Eighteen (minutes) to seventeen
© UCLES 2011 P110/MS/A/M/11 5 Stage 8 Paper 1 Mark Scheme Question 1 Part Mark Answer Further Information (a) 1 387 (b) 1 265 Total 2 Question 2 Part Mark Answer Further Information 1 4.96 Total 1 Question 3 Part Mark Answer Further Information 1 Both must be ticked with no extras. Accept any clear indication. Total 1 Question 4 Part Mark Answer Further Information (a) 1 64 (b) 1 11 Total 2
© UCLES 2011 P110/MS/A/M/11 6 Question 5 Part Mark Answer Further Information (a) 1 0.01 Accept equivalent answer, e.g. 1001 (b) 1 0.1 Accept equivalent answer, e.g. 101 Total 2 Question 6 Part Mark Answer Further Information 1 5 (miles) Accept 4.8 to 5.2 inclusive. Total 1 Question 7 Part Mark Answer Further Information 2 Right-handed Left-handed Total Boys 4 10 14 Girls 3 12 15 Total 7 22 29 1 mark for either Boys or Girls row correct. Total 2 Question 8 Part Mark Answer Further Information 1 289 8 3 64 24 5421 40 15 Accept any clear indication. All three must be correct with no incorrect answers. Total 1
© UCLES 2011 P110/MS/A/M/11 7 Question 9 Part Mark Answer Further Information 1 12 cm 4 cm 13 cm 5cm13cm 12cm 13 cm 13 cm 13 cm 13 cm 5 cm13 cm Accept any clear indication. No extras ticked. Total 1 Question 10 Part Mark Answer Further Information (a) 1 2x+3 2(x−3) 3x−2 2x−3 3(x+2) Accept any clear indication. No extras ticked. (b) 2 3 (sweets) 1 mark for x = 2 x −3 or x = answer to (a) . Total 3 Question 11 Part Mark Answer Further Information 1 240 (cm 3) Total 1 Question 12
© UCLES 2011 P110/MS/A/M/11 8 Part Mark Answer Further Information (a) 2 Pattern number 1 2 3 4 10 Number of white counters 0 2 4 6 18 Total number of counters 1 3 5 7 19 1 mark for each correct column. (b) 1 2(n −1) or equivalent, e.g. 2n – 2 (c) 1 2(n −1) + 1 = 2n−1 or equivalent. Follow through for (b) +1 if (b) is algebraic. Total 4 Question 13 Part Mark Answer Further Information (a) 1 B and E, in either order (b) 1 B and D, in either order Total 2 Question 14 Part Mark Answer Further Information 2 75 (%) 1 mark for 3627 × 100 or equivalent method. Total 2
© UCLES 2011 P110/MS/A/M/11 9 Question 15 Part Mark Answer Further Information 2 (7,9) 1 mark for each coordinate. or 1 mark for clear method (algebraic or graphical) shown, e.g. evidence that coordinates of midpoint is average of two end points. Total 2 Question 16 Part Mark Answer Further Information 2 60% and 81 1 mark for each Total 2 Question 17 Part Mark Answer Further Information (a) 1 10 (b) 1 0.03 Accept equivalent answer, e.g. 1003 Total 2
© UCLES 2011 P110/MS/A/M/11 10 Question 18 Part Mark Answer Further Information (a) 1 Accept any clear indication. (b) 1 Both squares must be identified for the award of the mark. Accept any clear indication. Total 2 Question 19 Part Mark Answer Further Information (a) 1 28 Do not accept 2 – 30. (b) 1 22 Do not accept answers on diagram, e.g. 2 ringed. Total 2 Question 20 Part Mark Answer Further Information 2 5 154 1 mark for common denominator of 15 (or multiple of 15) Total 2
© UCLES 2011 P110/MS/A/M/11 11 Question 21 Part Mark Answer Further Information 2 Accurate construction with construction arcs, e.g. Accept ± 2°. Correct construction arcs must be seen. 1 mark for evidence of arcs in relevant position. Total 2 Question 22 Part Mark Answer Further Information 2 Shape B and any valid reason, eg. A is 185 B is 31 = 186 3 is more than 2 21 Do not award any marks for B without a reason. 1 mark for 185 and 31 Accept any valid method. Total 2 Question 23 Part Mark Answer Further Information 2 Diagonals are perpendicular Dia gonals have equal length Square Rhombus Rectangle Trapezium 2 marks for all correct. 1 mark for 2 correct rows or 1 correct column. Do not accept blank cells. Total 2
© UCLES 2011 P110/MS/A/M/11 12 Question 24 Part Mark Answer Further Information (a) 1 4 and 6, in either order Both must be correct. (b) 1 6 and 7, in either order Both must be correct. Total 2
© UCLES 2011 P110/MS/A/M/11 13 Stage 8 Paper 2 Mark Scheme Question 1 Part Mark Answer Further Information 1 1.070 1.24 1.3 1.39 1.5 Total 1 Question 2 Part Mark Answer Further Information 1 3.75 Total 1 Question 3 Part Mark Answer Further Information 2 Yes, and a correct explanation, e.g. both are 12 or LCM of 4 and 6 is 12 and HCF of 24 and 36 is 12 No mark for yes without an explanation. 1 mark for 12 as either LCM or HCF Total 2 Question 4 Part Mark Answer Further Information 1 0.2 Total 1
© UCLES 2011 P110/MS/A/M/11 14 Question 5 Part Mark Answer Further Information (a) 1 corresponding Accept any discernable spelling. (b) 1 alternate Accept any discernable spelling. Total 2 Question 6 Part Mark Answer Further Information 2 David ($) 8.80 Jo ($) 13.20 Mary ($) 22.(00) 1 mark for attempt to divide 44 by 10 Award 1 mark for all three correct answers but with currency information incorrect, e.g. 8.8 Total 2 Question 7 Part Mark Answer Further Information (a) (i) 1 36y (cents) or equivalent form Accept e.g. 36 × y, y 36 (ii) 1 (C=) 36y + 12z (cents) or equivalent form Follow through answer to (a)(i) (b) 1 340 (cents) Total 3
© UCLES 2011 P110/MS/A/M/11 15 Question 8 Part Mark Answer Further Information (a) 1 8:35 (am) (b) 1 3 (km) (c) 1 8:26 (am) or 8:27 (am) Total 3 Question 9 Part Mark Answer Further Information (a) 1 x –1 0 1 2 3 y –5 –3 –1 1 3 All three points must be correct. (b) 1 x –5 –4 –3 –2 –1 y –5 –4 –3 –2 –1 1 2 3 4 5 0 y = 2x – 3 12345 Accept correct line without visible points. Accept line that stops at (–1,–5) and / or (3,3) Accept line without label. (c) 1 No and 29 ≠ 2×15−3 or equivalent explanation. Do not award mark for NO without an explanation. Total 3
© UCLES 2011 P110/MS/A/M/11 16 Question 10 Part Mark Answer Further Information 2 2 3 × 3 × 5 2 × 11 or equivalent 1 mark for list of correct factors or a correct factor tree. 1 mark for identification of 4 prime factors, 2, 3, 5, 11 or for evidence of the correct method. Total 2 Question 11 Part Mark Answer Further Information (a) 1 (y =) 4x – 3 or equivalent form Accept e.g. 4 × x or x 4 for 4x (b) 1 8 21 or equivalent Total 2
© UCLES 2011 P110/MS/A/M/11 17 Question 12 Part Mark Answer Further Information (a) 1 Method of travel Frequency Angle in pie chart Car 10 120° Walk 9 108° Bus 8 96° Circle 3 36° Total 30 360° 108° and 96° must be seen. Accept omission of 360° Accept omission of ° (b) 2 Car Walk BusCycle Award 2 marks for correct chart correctly labelled; angle within ± 2° Award 1 mark for correct chart with no labels or at least one correct sector with label. Total 3 Question 13 Part Mark Answer Further Information 1 8 81 or 10 81 Do not accept 10.125 Total 1
© UCLES 2011 P110/MS/A/M/11 18 Question 14 Part Mark Answer Further Information 1 56 ÷ 3 170 ÷ 9 113 ÷ 6 131 ÷ 7 93 ÷ 5 Both correct with no additional ticks. Accept any clear indication. Total 1 Question 15 Part Mark Answer Further Information 2 Accurate net with tolerance of ± 2mm per line and ± 2° per angle, e.g. 1 mark for inaccurately drawn net with 4 correctly positioned triangles. Total 2 Question 16 Part Mark Answer Further Information 2 ($) 9413.60 Accept any answer between ($) 9413 and ($) 9414 inclusive. 1 mark for amount after 1 year $11 480 or 14000 × 0.82 × 0.82 or equivalent seen Total 2
© UCLES 2011 P110/MS/A/M/11 19 Question 17 Part Mark Answer Further Information 1 129 >128 or 0.75>0.666... or equivalent. Total 1 Question 18 Part Mark Answer Further Information (a) 1 16 (girls) (b) 2 208
© UCLES 2011 P110/MS/A/M/11 20 Question 20 Part Mark Answer Further Information (a) 1 5a − 3a + 2b − 4b = 2a −2b (b) 1 3x − 4y + 7x - 3y = 10x − 7y Total 2 Question 21 Part Mark Answer Further Information 1 92 8 5 114 207 33 14 All three must be correct with no incorrect answers. Accept any clear indication. Total 1 Question 22 Part Mark Answer Further Information (a) 1 24(cm²) (b) 1 4(cm) Allow follow through from part (a) ÷ 6 Total 2
© UCLES 2011 P110/MS/A/M/11 21 Question 23 Part Mark Answer Further Information 2 Can and a correct explanation Either Can 1 ml for 0.1666..cents and Bottle 1 ml for 0.17 cents or Can $1 buys 600 ml and Bottle $1 buys 588(.2..)ml Two comparative figures must be seen. Accept equivalent arguments, e.g. using cents or litres. 1 mark for 0.1666.. or 0.17 or 1 mark for 600 or 588(.2..) No mark for “Can” with no explanation. Total 2 Question 24 Part Mark Answer Further Information 2 x + y + ∠ ABC = 180° x + y + ∠ ABC = z + ∠ ABC x + y = z Argument may be stated informally. Award 1 mark for each element. Do not accept ‘Exterior angle = sum of interior opposite angles’ on its own. Total 2
© UCLES 2011 P110/MS/A/M/11 22 Stage 8 Paper 3 Mark Scheme Question Mark Answer 1 ½ 400 2 ½ (0).4 3 ½ chord 4 ½ (0).48 5 ½ 7000(ml) 6 ½ 107 or equivalent 7 ½ a³ 8 ½ 4 (counters) 9 ½ 899 10 ½ 70(°) 11 ½ 270(cents) or equivalent 12 ½ 7(°C) ± 0.5°C 13 ½ 5 14 ½ (5,2) 15 ½ 10 16 ½ 33 (cm²) 17 ½ 27 12 or equivalent 18 ½ 5 (cm) 19 ½ 4 (accept TT, HH, TH, HT) or equivalent 20 ½ 4