Cambridge International Examinations Cambridge Secondary 1 Checkpoint
Cambridge International Examinations Cambridge Secondary 1 Checkpoint
MATHEMATICS Paper 1 MARK SCHEME Maximum Mark: 50
1112/01 October 2018
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 End of Series Report.
Cambridge will not enter into discussions about these mark schemes.
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
IB18 10_1112_01/4RP ? UCLES 2018
This document consists of 10 printed pages.
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1112/01 Question 1 2
3 4
Checkpoint Mathematics - Mark Scheme
October 2018
7.57 cao sight of 7. (...)
Answer
Less than 30
Equal to 30
More than 30
Marks
Further Information
2
B1
Do not accept 7r4 or 7 4 on its own.
7
2 Award 2 marks for all correct.
2 correct
B1
8
2
? 4
? 2
2 correct
B1
8 : 7
2
Any correct not fully simplified ratio provided the units are B1 the same e.g.
160 : 140, 16 : 14, 1.6 : 1.4, 1 : 0.875, 1 : , : 1, 1.14... : 1 etc. or correct numbers reversed, i.e. 7 : 8
Page 2 of 10
Anything with units e.g. 8 cm : 7 cm scores maximum 1 mark.
1112/01 Question 5 6(a) 6(b) 7(a) 7(b) 8
9
Checkpoint Mathematics - Mark Scheme
October 2018
Answer
Marks
Further Information
Rings d and ticks `Angles on a straight line add up to 180?'.
1 Allow any unambiguous indication of the correct answer.
8.7
9.1
9.5
41.5
1 Allow any unambiguous indication of the correct answer.
1
0
1
7
7
1 Allow any unambiguous indication of the correct answer.
13.8
1
4500
1
(y =) 63
2
28 ? 4 ? 3 ? 3 oe or 21 seen
M1
e.g. 28 ? 4 ? 3 ? ,
252 4
oe
900 (cm)
3
Correct method e.g. 20 ? 2 + 50 ? 2 + 70 ? 2 + 130 ? 2 + 180 ? 2 or 20 ? 2 + 70 ? 2 + 50 ? 4 + 130 ? 4
or answer 9 m
M2
for correct method with only one numerical error
or omission of one side
130 or 180 seen
M1
or
1 extra correct length marked on the diagram in any unit.
Page 3 of 10
1112/01 Question 10(a) 10(b)
11
Checkpoint Mathematics - Mark Scheme
October 2018
Answer
Marks
Further Information
GH or HG
1 Allow any unambiguous indication of the correct answer.
(x =) 70
2 Allow on second diagram next to x
Missing angle in first quadrilateral is 70? or the letter x
M1
or
100 + 105 + 85 + x = 360 or better e.g.
360 ? (100 + 105 + 85) or 360 ? 290
or
the missing angle value marked in the first quadrilateral is
their x
May be seen on diagram.
1
2
(11)
12
(4)
two numbers that add up to 13
B1
or
An integer value less than 11 in the 0-9 row and also an
integer value of at least 12 in the 20 ? 29 row
Condone 0 in the 0-9 row
Page 4 of 10
1112/01 Question 12
13
Checkpoint Mathematics - Mark Scheme
October 2018
Answer
4 and an explanation that includes one of the following 5
pairs
?
1 and 1 or equivalent fractions
4
5
? 0.2 and 0.25
? 20% and 25%
2 correct
Marks
Further Information
1 Condone 4 and an explanation that includes 5
one of the following pairs
? 0.8 and 1.25
? 80% and 125%
? and or equivalent fractions with common denominator
Accept finding and of a number and comparing.
Do not accept `fifths are smaller than quarters' alone.
May use diagrams as part of the explanation.
2 Allow any unambiguous indication of the correct answer.
B1
Page 5 of 10
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