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.

[Turn over

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

 ................
................

In order to avoid copyright disputes, this page is only a partial summary.

Google Online Preview   Download