Paper 42 (13th May) - Full Solutions

[Mahmood Magdy]

Q 11 b (ii) shouldn't the answer be the hypotenuse? i got 100/9!

 

[inquisitiveness]

i did not write the lines are extended from tangents i just wrote about which ever sides that were equal(included all sides)and about the angles...will i get 3 marks​

 

[SamThomas]

sir i did the correct working for the upper bound lower bound question but i think i wrote the answer for lower bound in the blank of upper bound and answer of upper bound in the blank of lower bound will they deduct marks? if yes how much? otherwise i lost only 1 mark

Most probably one mark

 

[Igcse giver]

No mark.

was this paper harder than winter 2011 as the A star grade then was 163 and 169 for v3 and v1?

 

[notnek01]

Q 11 b (ii) shouldn't the answer be the hypotenuse? i got 100/9!

10/3 is the hypotenuse.

100/9 is 11.11 and you can see from the diagram that this is too big.

 

[Mahmood Magdy]

10/3 is the hypotenuse.

100/9 is 11.11 and you can see from the diagram that this is too big.

OP2 is square root 10 and P2P3 is square root 10/3 so if u do pythagoras u should get the correct answer

 

[notnek01]

OP2 is square root 10 and P2P3 is square root 10/3 so if u do pythagoras u should get the correct answer

(Op3)^2 = sqrt(10)^2 +( sqrt(10)/3)^2

(OP3)^2 = 10 + 10/9 = 100/9

--> OP3 = sqrt(100/9) = 10/3

You forgot to square root.

 

[notnek01]

i did not write the lines are extended from tangents i just wrote about which ever sides that were equal(included all sides)and about the angles...will i get 3 marks​

Without an explanation, you'll lose at least 1 mark.

 

[Mahmood Magdy]

(Op3)^2 = sqrt(10)^2 +( sqrt(10)/3)^2

(OP3)^2 = 10 + 10/9 = 100/9

--> OP3 = sqrt(100/9) = 10/3

You forgot to square root.

so will i get 1 mark for it?

 

[notnek01]

so will i get 1 mark for it?

Probably yes.

 

[umair1161]

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.

u sir are a legend!! thank you!

 

[Mohamed Alhendi]

question 2 part (b) .. i wrote shear parallel to x-axis scale factor 2 is it all correct ?

 

[notnek01]

question 2 part (b) .. i wrote shear parallel to x-axis scale factor 2 is it all correct ?

You will lose 1 mark if you didn't use the word 'invariant'.

 

[himanshu dave]

sir for the last part I got n to be 19 will I get atleast 2 marks

 

[notnek01]

sir for the last part I got n to be 19 will I get atleast 2 marks

Yes, if your working was correct.

 

[himanshu dave]

sir in the last question where we had to use the pythagorus to find the hypotenuse I by mistake forgot to square the (100/9) it was of 2 marks will I get atleast 1 if my working till then was correct??

 

[notnek01]

sir in the last question where we had to use the pythagorus to find the hypotenuse I by mistake forgot to square the (100/9) it was of 2 marks will I get atleast 1 if my working till then was correct??

Probably 1.

 

[Swapneel Daxini]

the lowest i can get is 181 in both papers....any chance thats not a A*

 

[Hani Saghir]

Sir for 3-D,,,,, i wrote (2.5,3) and then m was 0.4
what are your comments and if i loose marks, how many approximately?

 

[xpfaddict]

guyx starting posting your final marks