Mark Scheme (Results)
October 2020
Pearson Edexcel iLower Secondary
Year 9 Mathematics (LMA11)
Achievement Test
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October 2020
Publications Code LMA11_01_2010_MS
All the material in this publication is copyright
© Pearson Education Ltd 2020
General Marking Guidance
•
All candidates must receive the same treatment. Examiners must
mark the first candidate in exactly the same way as they mark the
last.
•
Mark schemes should be applied positively. Candidates must be
rewarded for what they have shown they can do rather than
penalised for omissions.
•
Examiners should mark according to the mark scheme not according
to their perception of where the grade boundaries may lie.
•
There is no ceiling on achievement. All marks on the mark scheme
should be used appropriately.
•
All the marks on the mark scheme are designed to be awarded.
Examiners should always award full marks if deserved, i.e. if the
answer matches the mark scheme.
•
Examiners should also be prepared to award zero marks if the
candidate’s response is not worthy of credit according to the mark
scheme.
Where some judgement is required, mark schemes will provide the
principles by which marks will be awarded and exemplification may
be limited.
•
When examiners are in doubt regarding the application of the mark
scheme to a candidate’s response, the team leader must be
consulted.
•
Crossed out work should be marked UNLESS the candidate has
replaced it with an alternative response.
•
Types of mark
o M marks: method marks
o A marks: accuracy marks
o B marks: unconditional accuracy marks (independent of M
marks)
•
Abbreviations
o cao – correct answer only
o ft – follow through
o isw – ignore subsequent working
o SC - special case
o oe – or equivalent (and appropriate)
o dep – dependent
o indep – independent
o awrt – answer which rounds to
o eeoo – each error or omission
•
No working
If no working is shown then correct answers normally score full
marks
If no working is shown then incorrect (even though nearly correct)
answers score no marks.
•
With working
If there is a wrong answer indicated on the answer line always check
the working in the body of the script (and on any diagrams), and
award any marks appropriate from the mark scheme.
If it is clear from the working that the “correct” answer has been
obtained from incorrect working, award 0 marks.
If a candidate misreads a number from the question. Eg. Uses 252
instead of 255; method marks may be awarded provided the
question has not been simplified. Examiners should send any
instance of a suspected misread to review. If there is a choice of
methods shown, mark the method that leads to the answer on the
answer line; where no answer is given on the answer line, award the
lowest mark from the methods shown.
If there is no answer on the answer line then check the working for
an obvious answer.
•
Ignoring subsequent work
It is appropriate to ignore subsequent work when the additional
work does not change the answer in a way that is inappropriate for
the question: eg. Incorrect cancelling of a fraction that would
otherwise be correct.
It is not appropriate to ignore subsequent work when the additional
work essentially makes the answer incorrect eg algebra.
Transcription errors occur when candidates present a correct
answer in working, and write it incorrectly on the answer line; mark
the correct answer.
•
Parts of questions
Unless allowed by the mark scheme, the marks allocated to one part
of the question CANNOT be awarded to another.
Year 9 iLower Secondary Mathematics
Question
number
1
Answer
Question
number
2
Answer
Question
number
3
Answer
Question
number
4
Answer
Question
number
5
Answer
Question
number
6
Answer
Question
number
7
Answer
Question
number
8
Answer
Question
number
9
Answer
D
B
A
C
B
B
A
B
D
-
-
-
-
-
-
-
-
-
Mark
-18°C
(1)
Mark
3:2
(1)
Mark
1
(1)
Mark
Obtuse
(1)
Mark
1, 3, 6, 10, 15
(1)
Mark
8
(1)
Mark
2%
(1)
Mark
50 cm
(1)
Mark
y = 3x + 4
(1)
Question
number
10
Answer
Question
number
11
Answer
Question
number
12
Answer
Question
number
13
Answer
Question
number
14
Answer
Question
number
15
Answer
A
B
C
D
C
A
-
-
-
-
-
-
Mark
(2, 3)
(1)
Mark
90
(1)
Mark
160cm3
(1)
Mark
(3m)2
7
(1)
Mark
46
(1)
Mark
y = 3x
(1)
Section B
Question
number
16a
Working
Answer
Additional guidance
Mark
45 < t ≤ 60
B1
(1)
Question
number
16b
Working
Answer
Additional guidance
Mark
Range = MAX – MIN = 60 – 0
60
M1 for ‘highest’ – ‘lowest’ (2)
A1
Question
number
17a
Working
Answer
Additional guidance
Mark
1.176 × 10-6 oe
B1 accept 0.000001176
(1)
Question
number
17b
Working
Answer
Additional guidance
Mark
0.210
0.123
0.023
0.030
0.300
0.023
0.03
0.123
0.21
0.3
B2 for all five in correct
order
If not B2 then B1 for all
five in descending order,
or for four numbers in the
correct order
(2)
Question
number
18
Working
Answer
Additional guidance
Mark
eg. (23.5 × 150) ÷ 2 = 1762.5
(25 × 82.5) = 2062.5
Rectangle DEFG
B1 for correctly working
in consistent units in at
least one shape
M1 for correct method to
find area of triangle ABC
M1 for correct method to
find area of both shapes
A1 for two correct,
comparable areas and a
correct answer
(4)
or (0.235 × 1.5) ÷ 2 = 0.17625
(0.25 × 0.825) = 0.20625
Question
number
19a
Working
Answer
Additional guidance
Mark
0.175 × 432
75.6(0)
M1 for 0.175 oe
A1
(2)
Question
number
19b
Working
Answer
Additional guidance
Mark
3500 × 0.04 = 140
140 × 3 = 420
3500 + 420
3920
M1 correctly finds 1 years’ (2)
interest (140 or 3640)
A1
Question
number
20a
Working
Answer
Additional guidance
eg.
x = 16, y = -1
x = 14.5, y = 2
Any two different pairs of correct values B2 two correct pairs
(B1 for one correct pair)
Mark
(2)
Question
number
20b
Working
Answer
Additional guidance
Mark
28
B1
(1)
Question
number
20c
Working
Answer
Additional guidance
Mark
(12 + 4)2 ÷ (24 ─ 16)
162 ÷ 8
256 ÷ 8
32
M1 for one bracket
correctly evaluated (256 or
8)
A1
(2)
Question
number
21a
Working
Answer
Additional guidance
Mark
6
( )
1
B2 for correct answer
(B1 otherwise for vector
with one correct value, or
for both correct values but
not given as a vector)
(2)
Question
number
21b
Working
Answer
Additional guidance
Mark
─½
B2 for correct scale factor
(B1 otherwise for any
negative scale factor, or
for scale factor of ½ oe)
(2)
Question
number
22a
Working
Answer
Additional guidance
Mark
m2 – 3m – 7m + 21
m2 – 10m + 21
B2 for correct answer
(B1 otherwise for three
correct terms with correct
sign, or all four correct
terms regardless of signs)
(2)
Question
number
22b
Working
Answer
Additional guidance
Mark
8a2 (3a – 2b) oe
B2 for correct answer
(B1 otherwise for correct
HCF taken out, or for
correctly factorising by
another factor involving
number AND letter)
(2)
Question
number
22c
Working
Answer
Additional guidance
Mark
4
M1 for x-1 or 𝑥
A1 accept 4x-1
(2)
Question
number
23a
Working
Answer
Additional guidance
Mark
20 : 48
1 : 2.4
M1 for dividing 48 by 20
A1
(2)
4x-1
÷20
𝑥
÷20
oe
1
Question
number
23b
Working
Answer
Additional guidance
Mark
5 + 4 + 3 = 12
168 ÷ 12 = 14
5×14 : 4×14 : 3×14
70 : 56 : 42
M1 for complete correct
method OR for two out of
three values correct
A1
(2)
Question
number
24
Working
Answer
Additional guidance
Mark
½ × 6 × 8 × 12
288 cm3
M1 for correct method
A1 for 288
B1 for correct units
(3)
Question
number
25a
Working
Answer
Additional guidance
Mark
120 (±2°) + 180
OR
360 - 60 (±2°)
300° (±2°)
M1 for correct relevant
angle (±2°) or correct
method
A1 (±2°)
(2)
Question
number
25b
Working
Answer
Additional guidance
Mark
6cm (±0.2cm) ÷ 4 = 1.5
5 × ‘1.5’
7.5
M1 for correct length
(±2mm) and correct
method
A1ft from their correct
length (±2mm)
(2)
Question
number
26
Working
Answer
Additional guidance
Mark
Correct triangle with construction arcs
B1 for correct arcs
B1 for correct triangle
(2)
Question
number
27
Working
Answer
Additional guidance
Mark
(5, 9)
(15, 14)
(25, 10)
(35, 7)
Correct points joined with straight lines
B2 for correct answer
(2)
(B1 otherwise for three out
of four points correct,
OR four correct points but
not joined,
OR four points at correct
heights joined with
straight lines at incorrect
but consistent points
within each interval)
Question
number
28a
Working
Answer
Additional guidance
Mark
8, 3, 0, -1, 0, 3, (8)
8, 3, 0, -1, 0, 3, (8)
(2)
28b
(-2, 8)
(-1, 3)
(0, 0)
(1, -1)
(2, 0)
(3, 3)
(4, 8)
Correct curve
B2 for correct answer
(B1 otherwise for at least
three correct values)
B2 for correct curve
(B1 otherwise for at least
four points plotted
correctly ft their table,
provided at least B1 in
Part a)
(2)
Question
number
29
Working
Answer
Additional guidance
Mark
Decision supported by correct evidence
eg. Sprinter A (because they are faster
on average) OR Sprinter B (because
they are more consistent)
M1 for correct method to
find average or range for
one sprinter
M1 for correct method to
find comparable average
or range for both sprinters
A1 for correct decision
with correct, comparable
average and/or range
(3)
Working
Answer
Additional guidance
Mark
£61 × 1.31 = $79.91
80 – 79.91 = $0.09
OR
$80 ÷ 1.31 = £61.06(87…)
61.06(87…) – 61 = £0.06(87…)
London by ($)0.09 or (£)0.06 or 0.07
M1 for 61×1.31 (=79.91)
OR 80÷1.31 (=61.0687…)
M1 (dep) for correct value
and correct difference
OR correct value and
correct decision
A1 for correct value,
correct decision and
correct difference
(3)
Mean
Median
Range
Question
number
30
Sprinter A
12.18
11.6
3.3
Sprinter B
12.275
12.25
0.2
Question
number
31
Working
Answer
Additional guidance
c2 = 32 + 52
c2 = 9 + 25
c2 = 34
c = √34
5.8(30951895…)
M1 for correct expression (3)
using Pythagoras
M1 for (c2 =) 34 OR for
c = √(‘34’)
A1 for a correct answer
(accept √34) with evidence
of a correct
Question
number
32
Working
Answer
Additional guidance
Mark
5 × 2x = 10x
3x+5 + x+1 + 3x+5 + x+1 = 8x + 12
161
M1 correct expression for
at least one perimeter
M1(dep) forms an
equation with their
perimeters
M1 x = 6
A1
(4)
10x = 8x + 12
10x – 8x = 12
2x = 12
x =6
(3 × 6) + 5 = 23
6+1=7
23 × 7
Mark
Question
number
33
Working
Answer
Additional guidance
Mark
2
10
M1 for 1/9
M1 for 2/10 × 1/9
M1(dep) for 5 × ‘2/90’
A1
SC: B2 for a complete
correct method without
replacement leading to an
answer of 1/5 oe
(4)
/10 × 1/9 = 2/90
5 × 2/90
[May be shown on a tree diagram]
/90 oe
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