# Edexcel GCSE Maths 2018 24th May Unofficial MarkschemeWatch

Announcements
Poll: How did we all think we did?
So amazing, omg I could be a mathematician LEVEL 9 (31)
16.58%
It was pretty good, made a few mistakes but overall YES (59)
31.55%
It was ok, I’m not gonna fail but not gonna get a 8/9 either (51)
27.27%
Are you kidding!? That was so hard, I’m praying for a 4 at most. (18)
9.63%
Kill me now. I’m retaking this year again. (16)
8.56%
Can’t tell yet (12)
6.42%
#1
THIS IS HIGHER
DONT STRESS ABOUT WHAT GRADE YOU CAN GET BECAUSE LITERALLY IF YOU MISSED THE LAST 2 QUESTIONS OUT COMPLETELY IT’S STILL POSSIBLE TO GET A 9!! I HOPE YOU DO WELL IN THE REST OF YOUR GCSES!

1)a) 3 11/28 or 95/28 (1 mark)
b) 1 3/5 (2 marks)
2)140 houses (3 marks)
3)30% higher (4 marks)
4)a) 25 days (3marks)
b) less days (1 mark)
5)a) Draw the pyramid (2 marks)
b)96 cm^2 (surface area of pyramid) (4 marks)
6)22,20 (Coordinates of squares) (5 marks)
7)216 cm^2n (area of triangle) (5 marks)
8)a) do the box plot correctly (2 marks)
b) 60 (2 marks)
9)a)6 (1 mark)
b)1 (1 mark)
c)1/9 (2 marks)
10) (3x+1)/2x (5 marks)
11) 90- 2x (4 marks)
12) 4 (n^2-n)+1 (4 marks)
13)5 (3 marks)
14) y= 100/9x^4 (5 marks)
15)a) (a+b)(a-b) (1 marks)
b) 12x^2+12 or 12(x^2+1) (3 marks)
16)0.12 or 3/25 (3 marks)
17)Sin graph move down two (2 marks)
18) rotation 180 degrees clockwise on point (-1,-2) (2 marks)
19) b = 2/3a + 2 (5 marks)
20)2,3,4 (5 marks)

The answer shown are correct. Trust that the answers are correct but I can’t quite remember the marks they were out of. Sorry.
2
1 year ago
#2
(Original post by Ranushka)
1)a) 3 11/28
b) 1 3/5
2)140 houses
3)30% higher
4)25 days
5)a) Draw the pyramid
b)96 cm^2 (surface area of pyramid)
6)22,20 (Coordinates of squares)
7)216 cm^2n (area of triangle)
8)a) do the box plot correctly
b) 60
9)a)6
b)1
c)1/9
10)
11) 90- 2x
12) 4 (n^2-n)+1
13)5
14) y= 100/9x^4
15)12x-12 or 12(x-1)
16)0.12 or 3/25
17)Sin graph move down two
18)
19) b = 2/3a + 2
20)2,3,4

The answer shown are correct. I can’t remember what the other questions were.
Could you include the marks ?
1
1 year ago
#3
did the first question say you have to give answer as a mixed number? or was it only the second one?
1
1 year ago
#4
(Original post by jamesgillian123)
did the first question say you have to give answer as a mixed number? or was it only the second one?
only the 2nd
0
1 year ago
#5
(Original post by Ranushka)
1)a) 3 11/28 (1 mark)
b) 1 3/5 (2 marks)
2)140 houses (3 marks)
3)30% higher (4 marks)
4)a) 25 days (3marks)
b) less days (1 mark)
5)a) Draw the pyramid (2 marks)
b)96 cm^2 (surface area of pyramid)
6)22,20 (Coordinates of squares) (5 marks)
7)216 cm^2n (area of triangle) (4 marks)
8)a) do the box plot correctly (3 marks)
b) 60
9)a)6 (1 mark)
b)1 (1 mark)
c)1/9 (2 marks)
10)
11) 90- 2x (4 marks)
12) 4 (n^2-n)+1 (4 marks)
13)5
14) y= 100/9x^4
15)a) (a+b)(a-b) (2 marks)
b) 12x-12 or 12(x-1) (3 marks)
16)0.12 or 3/25 (3 marks)
17)Sin graph move down two (2 marks)
18)
19) b = 2/3a + 2 (5 marks)
20)2,3,4 (5 marks)

The answer shown are correct. I can’t remember what the other questions were.
Is this Higher or Foundation????
2
1 year ago
#6
Question 11:
2
#7
(Original post by Dilligent)
Is this Higher or Foundation????
Higher
0
1 year ago
#8
Is Q4a not 19 ????
1
#9
(Original post by clock087)
Question 11:
To people who struggled with this question,

ABO was x and since BC was a tangent to the circle we know that angle OBC is 90 degrees.

OA and OB are both radii of the circle and therefore it is isosceles and that means that both angle OAB and ABO are x.

In a triangle there are 180 degrees so x + x + 90 = 2x +90. Then 180 - (2x + 90) = 90-2x.
0
1 year ago
#10
(Original post by Fgi 29)
Is Q4a not 19 ????
I think it is because you round everything to 1 significant figure. Everybody rounded the 15.something to 15 when it should be 20
1
#11
(Original post by Fgi 29)
Is Q4a not 19 ????
I rounded the distance to 3000 miles and then he said he travelled 15 miles per hour for 8 hours a day. That means he travelled 120 miles a day (because 15 miles x 8 is 120). Then 3000/120 =25 days.

But I think the markscheme would be flexible because it depends on how we each rounded it.
1
1 year ago
#12
So is 19 or 25 the correct answer for 4a ???
0
1 year ago
#13
(Original post by Ranushka)
To people who struggled with this question,

ABO was x and since BC was a tangent to the circle we know that angle OBC is 90 degrees.

OA and OB are both radii of the circle and therefore it is isosceles and that means that both angle OAB and ABO are x.

In a triangle there are 180 degrees so x + x + 90 = 2x +90. Then 180 - (2x + 90) = 90-2x.
Oh no I read the question wrong, I read angle ABC being X. Well ****
0
1 year ago
#14
what was question 10
1
1 year ago
#15
(Original post by Ranushka)
25 days is the correct answer.
25 is technically more accurate but estimating in gcses is rounding every to 1 significant figure so surely it would round up to 20 which makes the answer 18.75 (19)
0
#16
(Original post by mallen975)
25 is technically more accurate but estimating in gcses is rounding every to 1 significant figure so surely it would round up to 20 which makes the answer 18.75 (19)
In my school we did not learn that rounding to 1 significant figure was the standard for GCSEs. We learnt that rounding depends more on the numbers involved and how easily the answer can be calculated.

I think that you possibly rounded a bit too vaguely meaning the answer was too far from the answer, but you will probably still get marks for working out.
0
1 year ago
#17
Hi, does anyone remember the question for 2,7,13,19 ? Thanks
0
#18
(Original post by acuteangle182)
Hi, does anyone remember the question for 2,7,13,19 ? Thanks
2) This question was about houses, bungalows and flats with houses and bungalows having a ratio of something like 7:4 and bungalows and flats having a ratio of 8:5. Then we are told that there are 50 flats and we have to work out how many houses there are.

7) This question was where they said that there is a right angled triangle with sides in the ratio of 35. The perimeter was 72cm. We had to find what the area of the triangle was.

13) This was a question that asked was something like sqr root of 5 ( sqr root of 8 + sqr root of 18).
You had to simplify the answer to be in the form of a sqr root 10. Then find out what a was.

19) This question was something about a line and perpendicular line.
These aren’t the right numbers but it said something like A is (3,4) and P is (a,b). A line perpendicular to this line is 3y + 2x = 7. You had to find out what b was in terms of a.

The answer was b= 2/3a + 2
0
1 year ago
#19
Do you think 26 will be accepted on q4a? That's the only answer I got different to the the mark scheme I mean surely there might be some leniency lool
0
1 year ago
#20
say if i get an average 9 for paper 2 and paper 3 would i still get a 9 overall if i got a low 8 on this test.
0
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