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Maths exam IGCSE - HIGHER TIER - PAPER 3H AND PAPER 4H POST DISCUSSION.

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Reply 120

H!story

^ I think your suppose to lower bound 3.5 to 3.45 then times it together to get the surface area of the cube

Reply 121

gabriel 41

Original post by Emsss

That was right. It was 40.4%

How sure are you? Is that the marking scheme answer? Have you seen it published officially? It could also be wrong.

Reply 122

connor17

Cant anyone remember what they got for the probability ones? :/

Reply 123

Mobility

Original post by MAZADO

For the scale factor of the area did you have to use scale factor 4 or 5.
Was the answer 50 or 32?

I used scaled factor 4, but I think it's wrong. Others said it was 5.

Reply 124

gabriel 41

Original post by Emsss

I don't even remember that question :/ omg I didn't miss it out did I?

he's talking about maths B

Reply 125

connor17

Original post by H!story

^ I think your suppose to lower bound 3.5 to 3.45 then times it together to get the surface area of the cube

Nope. Didnt say anything about lower bounding the sides. Just said the lower bound for the volume is 4?.88.. sorry :/

Reply 126

Emsss

I'm confident . The people in my school are actual genius' and they take maths a year early :smile:

It's definitely not 37 though cos I remember doing it in class.
You have 100 to start with. It increases by 20 so now it's 1.2 then you times it by 1.17 as it increases by that.

1.404 ... It's increased by 40.4

Reply 127

desslop

AHH CRAP i used 3.455 for the lower bound one !!!!!!!!!!!!!!!!!!!!

Reply 128

Emsss

I also tried it on a random number ie 100 . Theres now 120 . 17% of that now is 20.4 .
120 + 20.4 is 140.4

Original is 100
Result 140.4
How much has it increased by then :')

Reply 129

H!story

Original post by gabriel 41

what was the answer to that polygon question? It was so hard!

Yep, the answer to the polygon question is simply sub the angle into the formula (N-2)180/n=... (I forgot). Then you divide by two. Therefore, since the polygon is regular then all the parts are built by isosceles triangles. Hence, you add the angle together then subtract by 180 to get a part of the center angle. Then you divide the angle you have with 360 which tells you how many N sides the polygon has which I think is n=10.

Well, the test was pretty messed up lol the next one is all just quadratics and stuff.

Reply 130

zzaacc

I also got 40.4% increase for the India question and a 10 sided polygon

Reply 131

Emsss

Do you think the next one will be easier ?

Reply 132

ZahwahPTTS

Will the grade boundaries be low?

Reply 133

zzaacc

I'm thinking the next one will be a lot harder with functions, harder graphs and differentiation...not to forget sets. Really scared of the next one :s-smilie:

Reply 134

Emsss

Original post by ZahwahPTTS

Will the grade boundaries be low?

I reckon 82 for a* .
Obviously not accurate atall as they haven't been atall. But i don't think it will be 84 or more

Reply 135

Emsss

Original post by zzaacc

I'm thinking the next one will be a lot harder with functions, harder graphs and differentiation...not to forget sets. Really scared of the next one :s-smilie:

Ahhh same

I've got so many exams this week as well :frown:

For the question where it gave you the volume of a cuboid and you had to lower bound the volume. Then cube root it . There square root it. Did you then times it by 6 ??

Reply 136

ZahwahPTTS

Original post by Emsss

I reckon 82 for a* .
Obviously not accurate atall as they haven't been atall. But i don't think it will be 84 or more

So an A would be something like 64, right?

Reply 137

ellevictoria1

Original post by Emsss

I'm confident . The people in my school are actual genius' and they take maths a year early :smile:

I didn't do it like that, but I got 40.4% too, so glad someone else did, I was starting to worry!

Reply 138

XxRahulXx

For that question with the 2 triangles in the big shape. The scale factor wasn't 4 was it?

Reply 139

zzaacc

Original post by Emsss

Ahhh same

I've got so many exams this week as well :frown:

For the question where it gave you the volume of a cuboid and you had to lower bound the volume. Then cube root it . There square root it. Did you then times it by 6 ??