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Paper 42 (13th May) - Full Solutions

How did you find this paper? Scale 1-5 (1 being easiest and 5 being hardest)

  • 1 (Very Easy)

    Votes: 30 4.8%
  • 2 (Easy)

    Votes: 36 5.7%
  • 3 (Average)

    Votes: 125 19.9%
  • 4 (Hard)

    Votes: 169 26.9%
  • 5 (Very hard)

    Votes: 268 42.7%

  • Total voters
    628
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1 mark.. because they wanted simplest form!
Finally got access to the paper and I would like to thank you a lot sir for this! :) I wanted to ask you these questions:
If we calculate minor arc how many marks will I lose? i remember my answer was 19 something...
For the probability thing, probability of wearing gloves was 7/10 so not wearing gloves will be 3/10... so i did P(no hat, no scarf, no gloves) = 5/8 * 5/6 * 3/10 isn't this correct? :/
for the speed of water i got 1.74 cm/min and not 1740 how many marks will be deducted?
for finding OP3 i used similarity and pythagoras theorem but my answer was 2.07 something :(
and lol i had no clue at all for calculating n i just wrote crazy numbers! :p
Thanks a lot sir! :D
Minor arc: Probably 1 mark, maybe 2.

3/10 is the probability of no gloves if a hat and scarf are worn (the branch under 7/10). This is not the same as the bottom branch.

You won't get any marks for 1.74. You may get marks for working.

Again, no marks for 2.07 but maybe marks for working.
 
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Thanks so much!
I just have one question, for the rotation 90° anti-clockwise about (0,0), I rotated it about a wrong point. Will that cost me all of my marks on that question? :(
 
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9ai. If you added 2*(your hexagon area) to the correct rectangles area then I think you'll get 2 marks.

9bii. I'm really not sure here. I was surprised it was a 5 mark question so I don't know how the marks will be given.

no, for the area of hexagon i did 4x6 and then multiplied answer by two..later i added this ans with the rectangle one
for 9bi) i used speed=distance/time but i didnt covert the litres, will i get any marks?
 
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no, for the area of hexagon i did 4x6 and then multiplied answer by two..later i added this ans with the rectangle one
for 9bi) i used speed=distance/time but i didnt covert the litres, will i get any marks?
Hexagon question: maybe 2 marks?

bi. If the rest of your working is correct, you'll get at least 2 maybe 3.
 
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Minor arc: Probably 1 mark, maybe 2.

3/10 is the probability of no gloves if a hat and scarf are worn (the branch under 7/10). This is not the same as the bottom branch.

You won't get any marks for 1.74. You may get marks for working.

Again, no marks for 2.07 but maybe marks for working.
If so is the case then I'm getting exactly 176/200 which is an 88%! :D <3
Thanks sir! :)
 
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Yes, I'm sure.
If there is no problem or wastage of your time sir, may you please post a multiplication of this matrix by the matrix from the shape we already have? I'm almost sure I multiplied but got a different answer.

And If I did it wrong, like rotation in opposite direction, will I lose all the marks?

Thanks in advance.
 
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If there is no problem or wastage of your time sir, may you please post a multiplication of this matrix by the matrix from the shape we already have? I'm almost sure I multiplied but got a different answer.

And If I did it wrong, like rotation in opposite direction, will I lose all the marks?

Thanks in advance.
I would prefer it if you post your working and I will correct it.
 
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24 hours have passed so here are full solutions to the 13th May IGCSE Maths Paper 42. These are my (IGCSE maths teacher) solutions and not the official solutions from CIE.

I’ll try to answer any questions regarding this paper but...

Since I don’t want to make any predictions that could be wrong, I will not answer any questions like, 'What will I need to get this grade?' or 'How hard/easy was the paper, what will the A boundary be?'.

I’ll only say that I thought it was a very hard paper, one of the hardest in recent years.

Here are the average total grade boundaries over the last 2 years:

A* : 174.7/200
A : 145.6/200
B : 114.8/200
C : 84.4/200

You can see my solutions to Paper 22 here.


sir what if i wrote 184.5-100 to give the percentage profit in 1d how many marks am i doing to loose
 
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