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# Edexcel IGCSE Mathematics June 2016 Official Thread

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1. (Original post by lattu27)
Attachment 538757
I'm pretty sure this is the right method if anyone wanted it
Sorry I am wrong , that is correct ^^

I hate the mistakes you make under exam pressure!!!!!
2. can someone explain why 4.5cm to 0.5 cm is 4.75
3. (Original post by alic12345)
can someone explain why 4.5cm to 0.5 cm is 4.75
So because it's to 0.5 cm, the actual value could have been 4, 4.5 or 5

Therefore the upper bound is halfway between 4.5 and 5, which is 4.75
4. (Original post by alic12345)
can someone explain why 4.5cm to 0.5 cm is 4.75
cause 0.5 means half a cm therefor the upper bound it 4.75 and the lower bound is 2.25 , I'm probably wrong so don't take my word for it
5. (Original post by aaljhfgahsj)
I am fairly sure my answers are correct' here are some of the harder questions answers:

Last question: range 185-188 acceptable
Probability: lots of people got different answers; I got 5/28
Angle ODC question: 63 degrees
Re-arranging question: t= 1+3m/m-1 (something like that)
Cubes question: 1439 cubes
Rupees question: 52%
Volume of vase (or whatever it was): 102.4cmcubed
For the last question it is 188 - you need to keep all the numbers in you calculator each time. They won't accept anything less.
6. (Original post by alic12345)
can someone explain why 4.5cm to 0.5 cm is 4.75
The easiest thing to do is to halve the accuracy that it is given to. So 0.5/2 is 0.25. For the upper bound, you add 0.25, for the lower bound, you take away 0.25
7. Usually they give an allowance of +1/-1 off the answer, in this case 187 to 189
8. (Original post by sphintus)
anyone else did the 3HR paper? if so what did you get for the circle theorems question?
Sorry this is not really helpful but do you know what the difference is between 3H and 3HR?
9. What did everyone get as the angle for the 3d shape question??
10. (Original post by sivthasan)
Usually they give an allowance of +1/-1 off the answer, in this case 187 to 189
Really? In my experience you have to write down every number in your calculator without rounding - especially if it asks for a certain number of sig figs
11. (Original post by lattu27)
Sorry this is not really helpful but do you know what the difference is between 3H and 3HR?
The R stands for regional. It's done by students abroad. I've always found the HR harder than the normal one but idk maybe it's a coincidence :/
12. (Original post by Pooh monk)
Really? In my experience you have to write down every number in your calculator without rounding - especially if it asks for a certain number of sig figs
Yeah, that's true; it's best to store it on your calculator to avoid the hassle. On the mark scheme, it does give some leeway.
13. (Original post by Spinal tap)
What did everyone get as the angle for the 3d shape question??
I remember it being tan inverse of 8/ root 314 giving answer of 24 or something like that :/
14. (Original post by DJShaji)
I remember it being tan inverse of 8/ root 314 giving answer of 24 or something like that :/
yeah okay good I got 24 too
15. ^^ Same as my answer of 24.3 (to 3s.f)
16. Hey. What did people get for the circle theorem?
17. (Original post by lattu27)
Sorry this is not really helpful but do you know what the difference is between 3H and 3HR?
im pretty sure just the regions. different regions do different ones for e.g asia does HR (i think) and from what i've experienced i think HR papers are slightly harder.
18. (Original post by Milena1810)
Hey. What did people get for the circle theorem?
63 degrees - 48+15
19. (Original post by Pooh monk)
63 degrees - 48+15
HELL YES I got 63 too
20. how many marks was the spheres question?

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