Am I just being stupid? GCSE Maths help!

Oooh oooh ooooh I missed the thread. I did Geography and Maths (both higher) today.

Agree with what people say above, I spent a lot of time over half term trying to memorise case studies and then there was hardly any oppurtunity to put them in! (I did glaciation, coasts, and weather & climate). Slightly worrying was the fact that I'm normally working 'till the last 5 minutes in all exams, and I finished 30 minutes early! Ended up going through the whole thing a fair few times looking for places to put case studies in, managed to get one in for the tropical storm one (Banglidesh).

Maths... harder than the past papers I did from 2004 & 5, but not too bad. I was on question 16 about 40 minutes in thinking wow this is easy, then I hit the rest of the paper. Finished with 30 minutes to spare but had missed a few out, went back and corrected them.

Had trouble on the one involving inverse proportion (boiling a kettle), gave it four attempts and crossed them all out thinking I had to do some massive calculation in my head, then realised I could do some cancelling and got the answer. I filled up the whole of that page with working!

Also, the one with the fractions, something like this or similar.
3/(x+1) + 3/(2(x+1)) = 2
Denominators might not have been x + 1, I can't quite remember. Had to solve X, first time round I got x = 1/2 then I thought I'd got it wrong, gave it a second go and got x = 4 1/2. Anyone else get this?

Hope I did OK... English tomorrow :(
 
Simplest way to do that is multiply by the 2(x+1), giving 6 + 3 = 4(x+1). Multiply out to give 9 = 4x + 4, then evidently 4x = 5, x = 5/4.
 
I turned everything upside down first time giving
(x+1)/3 + (2(x+1))/3 = 1/2
3(x+1)/3 = 1/2
x+1 = 1/2
And... well clearly the denominator wasn't x+1 but that was the gist of how I did it. Second time round I multiplied everything by 2(x+a) (calling it a now since it wasn't 1).
 
LeperousDust said:
Thats just A/AS Level :)
I meant that he's doing maths(i assume) at uni(his location) and therefore he would be using the more advanced way more often. We're taught it too, its just it's easier to do the simpler thing. I guess it's more habit for uni people.
 
null said:
Oooh oooh ooooh I missed the thread. I did Geography and Maths (both higher) today.

Agree with what people say above, I spent a lot of time over half term trying to memorise case studies and then there was hardly any oppurtunity to put them in! (I did glaciation, coasts, and weather & climate). Slightly worrying was the fact that I'm normally working 'till the last 5 minutes in all exams, and I finished 30 minutes early! Ended up going through the whole thing a fair few times looking for places to put case studies in, managed to get one in for the tropical storm one (Banglidesh).

Maths... harder than the past papers I did from 2004 & 5, but not too bad. I was on question 16 about 40 minutes in thinking wow this is easy, then I hit the rest of the paper. Finished with 30 minutes to spare but had missed a few out, went back and corrected them.

Had trouble on the one involving inverse proportion (boiling a kettle), gave it four attempts and crossed them all out thinking I had to do some massive calculation in my head, then realised I could do some cancelling and got the answer. I filled up the whole of that page with working!

Had the same experience with those two papers...

Geography no case studies, I did rivers coasts ice.
Rivers there was something about flooding, but it was that specific area.
All I could do was stuff like there are revetements and rip rap at Clifton Way in Overstrand, North Norfolk. No case studies, just locations :/ Annoying since I learnt it all :o Finished half an hour earlier too. In geography normally I'm writing till the end, and having to finish on the bell due to too much to write. There simply wasn't for this paper :( ;)

And maths, that inverse proportion thing I forgot completely how to do until the last minute. Got something like 5*0 (forgotten exactly) for the seconds.
Everything else wasn't too bad, although the first 13q's were very easy, with the last lot being much harder, although admittedly nothing near as hard as ones we've done on mocks etc. Had no time to spare as I was racking my brains trying to find out how to do inverse proportions (No idea how I forgot as we've done so much on them.)

I found the parallelogram on the square/2equilateral triangles proving the lengths were the same type question a bit hard until it finally clicked.
Not a fan of those questions, as it's hit or miss whether you realise what's going on.

Circle theorem question was really, really easy, which surprised me :)
 
Had trouble on the one involving inverse proportion (boiling a kettle), gave it four attempts and crossed them all out thinking I had to do some massive calculation in my head, then realised I could do some cancelling and got the answer. I filled up the whole of that page with working!


for the second part of that question k was in the millions :confused:

i can normally do proportionality questions easily, but that was hard!
 
georges said:
I meant that he's doing maths(i assume) at uni(his location) and therefore he would be using the more advanced way more often. We're taught it too, its just it's easier to do the simpler thing. I guess it's more habit for uni people.
Close - doing Engineering. Hence no maths next year (third year)... although all modules will involve maths, just no more new stuff (hopefully!).

Also, I don't remember complex numbers being anywhere near my AS/A-Level course!
 
georges said:
I found the parallelogram on the square/2equilateral triangles proving the lengths were the same type question a bit hard until it finally clicked.
Not a fan of those questions, as it's hit or miss whether you realise what's going on.
Didn't even write anything for the proof one :eek: I generally don't like questions with worded answers, just couldn't see it. Plus the fact it was only 2 marks and I found the other questions I had difficulty with more interesting.

inferno said:
for the second part of that question k was in the millions
Yeah that was my problem. Just gonna see if I can remember the question now....

Information given: When T = 360, P = 1400. Find T when P = 900. That was it. So, when I finally get there (4 attempts later, should have spotted it earlier :o ) this was my working:

T = (1/P)k
360 = (1/1400)k
k = 360/(1/1400)
k = 360 * 1400
T = (1/P)*360 * 1400
T = (1/900) * 360 * 1400
T = (360 * 1400)/900

Then I cancelled two 0s off the top and bottom giving T = (360 * 14)/9
9 into 360 is easy - 40, so it's 40 * 14 which gives 560 seconds as the answer :)
 
inferno said:
for the second part of that question k was in the millions :confused:

i can normally do proportionality questions easily, but that was hard!
it wasn't quite in the millions 504000 i beleive for the inversley proportional one. The whole paper i found quite easy tbh struggled rearranging the formula but got there in the end :)

3/(x+1) + 3/(2(x+1)) = 2
IIRC i got x = 2.25 and for the second part of that managed to get y = 2.5 or y = -0.5
 
null said:
Mine was such that I had to leave in surd form. Answer I got was +/- root(2) + 1 :confused:
I'm guessing that becuase I managed to get x = 9/4 = 2.25 whereas you seem to have got somthing different, meh it's over now. Thank god!! :)
 
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