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# Edexcel IGCSE Mathematics A - Paper 3H - 2016 - Unofficial Mark Scheme Watch

1. (Original post by _Xenon_)
What's grade boundaries like for AQA?
How many marks for a C and B for example?

Best of luck.
C was 55/175 B was 85/175 A 117/175 A* 145/175
2. For the question asking you to find an equation for a line passing through a point (question 13?) I think I may have got 3x-4y=19
3. (Original post by zXcodeXz)
C was 55/175 B was 85/175 A 117/175 A* 145/175
Just a little bit higher than my exams grade boundaries.
4. (Original post by shahida sulaiman)
what was the answer to the probability one igot something like 25 something out of 500 something
i did the following combinations
2 2 2
1 2 3
2 3 1
3 2 1
You missed out:
132
213
312
5. (Original post by Ryzoz)
You missed out:
132
213
312
indeed, the correct answer was 25/84.

working was something like (6*1/21)+1/84
6. (Original post by _Xenon_)
Please help us get together an unofficial mark scheme for the Edexcel IGCSE Mathematics A HIGHER TIER exam today. If you can remember any questions/answers (preferably with question numbers) please post below. Please note that the questions which are currently empty are labelled 'not done' and will be filled in ASAP. Many thanks.

Question 1
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1. Ingredients question.
(a) 750
(b) 30 muffins
Question 2(not done)
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2.
Question 3
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3. 38
Question 4 (not done)
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4.
Question 5 (not done)
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5.
Question 6 (not done)
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6.
Question 7 (not done)
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7.
Question 8 (not done)
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8.
Question 9 (not done)
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9.
Question 10
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10. 10.7 degrees (?)
Question 11 (not done)
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11.
Question 12 (not done)
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12.
Question 13 (not done)
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Question 14 (not done)
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Question 15 (not done)
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15.
Question 16
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16. Volume of the vase was 102 cm3.
Working out:ASF = 120/750 = 0.16
LSF = ASF square rooted, = square root of 0.16 = 0.4.
VSF = LSF cubed, = 0.064Therefore volume = 0.064*1600 = 102.4 cm3
=102 cm3 (3 s.f.)
Question 17 (not done)
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17.
Question 18 (not done)
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Question 19 (not done)
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19.
Question 20
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20. x=7, y=-3
Question 21
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21. 25/84
Question 22
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22. 188cm2
[Circle theorems was 63 degrees. Cube and sphere one was 1637 (?)]

If you remember the question numbers please let me know, thanks.
The last question was 219. My friends and I all do ad maths and that's what we all got.
7. (Original post by shahida sulaiman)
whaaaaaaat!!! out of 200
No i meant out of the 100... but lately grade boundaries have dropped so its probably around 65 for an A so 130 -140 overall
9. (Original post by _Xenon_)
Just a little bit higher than my exams grade boundaries.
Yeah I'll be happy with a B to be honest
10. (Original post by BobbyC12)
I split it into three triangles and worked out each area seperately.
11. (Original post by DreamingBigger)
The last question was 219. My friends and I all do ad maths and that's what we all got.
OK cheers, will change that.
12. (Original post by DreamingBigger)
The last question was 219. My friends and I all do ad maths and that's what we all got.
It was 188 - many more people got that, and i can personally show all the working if you wish...
13. (Original post by _Xenon_)
OK cheers, will change that.
No, 188 is right, dont change it...
14. (Original post by _Xenon_)
OK cheers, will change that.
Don't change it. Everyone that I've seen and talked to, got 188.
15. (Original post by _Xenon_)
OK cheers, will change that.
Its definately 188 100% certain
16. (Original post by Martins1)
No, 188 is right, dont change it...
ahh sorry
17. I loved that paper so much.... I know I haven't got 100% or anything, but I wasn't planning on it.
It was so much fun!!

(I sound ridiculously weird right now...)
18. what were questions 3 and 10 about i cant remember
19. 1. Split the pentagon up into a big isosceles and two equal scalene triangles.
2. You use 1/2absinC to get the area of the 2 scalene triangles.
3. Split the isosceles triangle into 2 right-angled ones.
4. Use cosine rule to find the hypotenuse of the right-angled triangles (same as the longest length of the scalene triangles)
5. Use Pythagoras to work out the height of the isosceles triangle.
6. Use 1/2xBxH to get the area of the isosceles, and add on the areas of the two scalene triangles you got at the beginning, to get 188.
20. (Original post by Ryzoz)
I split it into three triangles and worked out each area seperately.
Yeah you do that but for the top two right angle triangles you need to use the sine rule.

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