• date post

26-Jul-2020
• Category

## Documents

• view

2

0

Embed Size (px)

### Transcript of PRACTICE PAPER SET 3 - Beechen Cliff Maths Department ... ... PRACTICE PAPER SET 3. Higher Tier...

• ΑΒ

Practice Papers - Set 1- Teacher Booklet

GCSE MATHEMATICS PRACTICE PAPER SET 3 Higher Tier Paper 1 Mark Scheme

8300/1H

Version 1.0

• Page 2 Version 1.0

Further copies of this Mark Scheme are available from aqa.org.uk

Glossary for Mark Schemes GCSE examinations are marked in such a way as to award positive achievement wherever possible.

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.

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 0.5 as well as 2 1

[a, b] Accept values between a and b inclusive. [a, b) Accept values a ≤ value < b 3.14 … Allow answers which begin 3.14 eg 3.14, 3.142, 3.1416 Use of brackets It is not necessary to see the bracketed work to award the marks.

• MARK SCHEME – GCSE MATHEMATICS – PRACTICE PAPER - SET 3 – PAPER 1 HIGHER

Version 1.0 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.

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.

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.

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.

Continental notation Accept a comma used instead of a decimal point (for example, in measurements or currency), provided that it is clear to the examiner that the candidate intended it to be a decimal point.

Page 4 Version 1.0

1 18π B1

2 6x3 – 15x2 B1

3 x > –2 B1

4 50 × 3 B1

5

3 x = 12 + 9

or 3 x = 21

or x – 9 × 3 = 12 × 3 or x – 27 = 36

M1

12 → + 9 → × 3

or (12 + 9) × 3

63 A1

12 + 9 × 3 = 39 M0A0

• MARK SCHEME – GCSE MATHEMATICS – PRACTICE PAPER - SET 3 – PAPER 1 HIGHER

Version 1.0 Page 5

6(a)

Alternative method 1

7.2 – 4.8 or 2.4 M1

12 A1

Alternative method 2

7.2 – at least eight 0.2s

or 4.8 + at least eight 0.2s M1

12 A1

Alternative method 3

7.2 ÷ 0.2 or 36

and 4.8 ÷ 0.2 or 24 M1

12 A1

Page 6 Version 1.0

6(b)

It will take fewer days B1

oe the answer would be lower

eg it will be less than 12

Quicker/faster than 12 days B1

Quicker/faster alone B0

7

DAE = 180 − 65 − 72 or 43 or ABC = 65 or DAB = 72 or EDB = 180 − 65 or 115 or BAE = 180 − 65 or 115

M1

May be on diagram in correct position

BAC = 180 − 65 − 65 or 50 or ADB = 115 − 72 or 43 and ACD = 115

or BAC = 50, BAE = 115 and ADB = 115 − 72 or 43

or CAE = 65 and DAE = 43 or DAB = 72 and BAC = 50

M1

May be on diagram in correct position

oe

72 – 50 = 22 or 180 − 115 − 43 = 22 or 115 − 50 − 43 = 22 or 65 − 43 = 22

A1

eg 115 or A = 50 is ambiguous

Written work takes precedence over diagrams if contradictory.

M0

• MARK SCHEME – GCSE MATHEMATICS – PRACTICE PAPER - SET 3 – PAPER 1 HIGHER

Version 1.0 Page 7

8(a)

Alternative method 1

43 – 28 or 15 seen M1

15 – 13 (= 2) or 2, 13 and 15

A1

Alternative method 2

x + 2y = 28 and 2x + 3y = 43 M1 oe equations

Solves equations correctly obtaining

x = 2 A1

If setting up two equations, they must be correct

8(b)

b – a M1 Second term

2b – a M1dep

oe

Fourth term

3b – a A1

Page 8 Version 1.0

9

The method will sometimes give an answer which is a whole number B1

64 = 8

or

correctly evaluated example where the answer is a whole number

B1

eg 5² – 4² = 9 and 9 is a square number or 5² – 4² = 3² oe

Correctly evaluated example where the answer is not a whole number B1

eg 3² – 2² = 5 and 5 is not a square number

oe

1 or 2 marks can be gained for example(s) even if the decision is incorrect

32 − 22 = 5 and 5 is between 4 and 9, implies 5 is not square B0B0B1

• MARK SCHEME – GCSE MATHEMATICS – PRACTICE PAPER - SET 3 – PAPER 1 HIGHER

Version 1.0 Page 9

10(a)

Alternative method 1

25 ÷ 50 (× 60) or 30 minutes or 1 2

h

or

20 ÷ 30 (× 60) or 40 minutes or 2 3

h

or

30 ÷ 40 (× 60) or 45 minutes or 3 4

h

M1

oe

Two of

25 ÷ 50 (× 60) or 30 minutes or 1 2

h

and

20 ÷ 30 (× 60) or 40 minutes or 2 3

h

and

30 ÷ 40 (× 60) or 45 minutes or 3 4

h

M1

oe

25 ÷ 50 (× 60) or 30 minutes or 1 2

h

and

20 ÷ 30 (× 60) or 40 minutes or 2 3

h

and

30 ÷ 40 (× 60) or 45 minutes or 3 4

h

M1

oe

C with all working correct A1 oe

Condone missing units, but note that 30 is given as both a distance and a speed in the question

Mark scheme for 10(a) continues on the next page

Page 10 Version 1.0

10(a)

Alternative method 2

20 ÷ 30 (× 60)

or 40 minutes

or 2 3

h

30 ÷ 40 (× 60)

or 45 minutes

or 3 4

h

M1

25 ÷ 50 (× 10)

or 30 minutes

or 2 1 h

50 × 2 3

or 33(.3..) miles

or

40 × 2 3

or 26(.6..) miles

or 26.7 miles

50 × 3 4

or 37.5 miles

or

30 × 3 4

or 22.5 miles

M1

30 × 2 1 or 15 miles

or 40 × 2 1 or 20 miles

50 × 2 3

or 33(.3..) miles

and

40 × 2 3

or 26(.6..) miles

or 26.7 miles

50 × 3 4

or 37.5 miles

and

30 × 3 4

or 22.5 miles

M1

C with all working correct A1 oe