GCSE Mathematics (8300) Specimen mark scheme …

1 Practice Papers - Set 1- Teacher Booklet GCSE Mathematics New Specimen Papers published June 2015 paper 3 Higher - Mark scheme 8300/3H Version Page 2 Version Principal Examiners have prepared these mark schemes for Specimen papers. These mark schemes have not, therefore, been through the normal process of standardising that would take place for live papers. Further copies of this Mark scheme are available from Glossary for Mark Schemes GCSE examinations are marked in such a way as to award positive achievement wherever possible.

2 Thus, for GCSE Mathematics papers, marks are awarded under various categories. If a student uses a method which is not explicitly covered by the mark scheme the same principles of marking should be applied. Credit should be given to any valid methods. Examiners should seek advice from their senior examiner if in any doubt. M Method marks are awarded for a correct method which could lead to a correct answer. A Accuracy marks are awarded when following on from a correct method. It is not necessary to always see the method. This can be implied.

3 B Marks awarded independent of method. ft Follow through marks. Marks awarded for correct working following a mistake in an earlier step. SC Special case. Marks awarded within the scheme for a common misinterpretation which has some mathematical worth. M dep A method mark dependent on a previous method mark being awarded. B dep A mark that can only be awarded if a previous independent mark has been awarded. oe Or equivalent. Accept answers that are equivalent. eg accept as well as 21 [a, b] Accept values between a and b inclusive.

4 Accept answers which begin eg , , Use of brackets It is not necessary to see the bracketed work to award the marks. MARK scheme GCSE Mathematics UPDATED Specimen PAPERS paper 3 HIGHER Version Page 3 Examiners should consistently apply the following principles Diagrams Diagrams that have working on them should be treated like normal responses. If a diagram has been written on but the correct response is within the answer space, the work within the answer space should be marked. Working on diagrams that contradicts work within the answer space is not to be considered as choice but as working, and is not, therefore, penalised.

5 Responses which appear to come from incorrect methods Whenever there is doubt as to whether a student has used an incorrect method to obtain an answer, as a general principle, the benefit of doubt must be given to the student. In cases where there is no doubt that the answer has come from incorrect working then the student should be penalised. Questions which ask students to show working Instructions on marking will be given but usually marks are not awarded to students who show no working. Questions which do not ask students to show working As a general principle, a correct response is awarded full marks.

6 Misread or miscopy Students often copy values from a question incorrectly. If the examiner thinks that the student has made a genuine misread, then only the accuracy marks (A or B marks), up to a maximum of 2 marks are penalised. The method marks can still be awarded. Further work Once the correct answer has been seen, further working may be ignored unless it goes on to contradict the correct answer. Choice When a choice of answers and/or methods is given, mark each attempt. If both methods are valid then M marks can be awarded but any incorrect answer or method would result in marks being lost.

7 Work not replaced Erased or crossed out work that is still legible should be marked. Work replaced Erased or crossed out work that has been replaced is not awarded marks. Premature approximation Rounding off too early can lead to inaccuracy in the final answer. This should be penalised by 1 mark unless instructed otherwise. Page 4 Version Q Answer Mark Comments 1 10 000 B1 2 57 B1 3 B1 4 D B1 5 Alternative method 1 (0) or M1 their (0) ( 100) or ( ) or M1dep ( ) or or A1 Allow 75 with correct method seen Alternative method 2 (0) ( 100) or ( ) or or ( ) or M1 ( ) 1 or 1 or ( ) 100 or 100 M1dep ( )

8 Or or A1 Allow 75 with correct method seen MARK scheme GCSE Mathematics UPDATED Specimen PAPERS paper 3 HIGHER Version Page 5 Q Answer Mark Comments 6 9 + 3x + x 5 + 2x or 6x + 4 or 3x + x 5 + 2x or 6x 5 M1 oe their (6x + 4) = 100 or their 6x 5 = 91 or 6x = 96 M1 oe )(46their9+x = 1009 x = 16 A1 10011 B1ft ft their 16 7 One continuous arc, centre A, intersecting AB and AD or Two arcs, each with same radius and centre A, intersecting AB and AD M1 Allow 2 mm for radii Intersecting arcs with same radius and centres at the intersections with AB and AD and angle bisector drawn A1 Allow 2 mm for radii The radius of these arcs need not be the same as those used for M1 Arc of radius [ , ] cm, centre C, intersecting their angle bisector and P labelled SC1 Arc of radius [ , ]

9 Cm, centre C with no angle bisector attempted D C A B P Page 6 Version Q Answer Mark Comments 8(a) (1656) B1 Condone if correctly rounded to 7 significant figures or better eg 8(b) 202 or 400 or 31000 or 10 or 5 M1 400 10 5 = 398 or 400 2 = 398 A1 9 octagon B1 MARK scheme GCSE Mathematics UPDATED Specimen PAPERS paper 3 HIGHER Version Page 7 Q Answer Mark Comments 10 Alternative method 1 PCB = 180 90 15 or 75 or PCB = 90 15 M1 oe Angle may be seen on diagram ABC = PCB = their 75 and BCD = 180 their 75 or 105 M1 oe Angle may be seen on diagram x = 105 75 = 30 A1 Full method required Alternative method 2 PCB = 180 90 15 or 75 or PCB = 90

10 15 M1 oe Angle may be seen on diagram ABC = PCB = their 75 and ABP = their 75 15 or 60 and BAC = 180 90 their 60 M1 oe Angles may be seen on diagram x = BAC = 30 A1 Full method required Alternative method 3 PCB = 180 90 15 or 75 or PCB = 90 15 M1 oe Angle may be seen on diagram ABC = PCB = their 75 and BAC = 180 their 75 their 75 M1 oe Angle may be seen on diagram x = BAC = 30 A1 Full method required Page 8 Version Q Answer Mark Comments 11 100(%) 14(%) or 86(%) or 1 or M1 Implied by 87 139(.)