Junior Cert 2011 : Maths Paper 2

flump_master · 13-06-2011 03:42PM

Thank you!

ciara95 · 13-06-2011 03:42PM

that went kinda well

normally i find paper 2 usually harder than paper 1, but I think I possibly might have done better in paper 2. Im not saying I got an A or anything, but I was pleasantly surprised!
I actually sat there smiling when I opened it up to find Theorems 4 and 7! As usual I found a few of the part C's hard. But I made an attempt at everything, I think.
How do you prove something is a parallelogram??
I didnt know what to do for 2c), 3c ii) and 5c). Apart from that I think I did okay:) I was expecting Paper 2 to bring me down, but it might of brought me up a bit....good times

also im now HALFWAY THROUGH the exams:)

omg a kitty · 13-06-2011 03:42PM

her0fire wrote: »

Answer was 100 for the first one m8 :P

yeh i forgot to add the other 28cm, Meh attempt marks ftw :cool:

flump_master · 13-06-2011 03:43PM

I got it wrong, for some reason i thought the distance was 28+7+7 so it threw my answer off, way heading for 100% too

flump_master · 13-06-2011 03:49PM

ciara95 wrote: »

How do you prove something is a parallelogram??

You had to show the two other triangles were congruent. Then that let you say that the opposite sides and opposite angles of the quadrilateral were equal in measure and thus that it was a paralellogram

Desire. · 13-06-2011 03:51PM

flump_master wrote: »

You had to show the two other triangles were congruent. Then that let you say that the opposite sides and opposite angles of the quadrilateral were equal in measure and thus that it was a paralellogram

So, for the second part all you had to say was that the opposite sides and opposite angles were equal?

ciara95 · 13-06-2011 03:53PM

Desire. wrote: »

So, for the second part all you had to say was that the opposite sides and opposite angles were equal?

now i feel stupid:pac:

Indiego · 13-06-2011 03:53PM

ciara95 wrote: »

that went kinda well normally i find paper 2 usually harder than paper 1, but I think I possibly might have done better in paper 2. Im not saying I got an A or anything, but I was pleasantly surprised!
I actually sat there smiling when I opened it up to find Theorems 4 and 7! As usual I found a few of the part C's hard. But I made an attempt at everything, I think.
How do you prove something is a parallelogram??
I didnt know what to do for 2c), 3c ii) and 5c). Apart from that I think I did okay:) I was expecting Paper 2 to bring me down, but it might of brought me up a bit....good times

also im now HALFWAY THROUGH the exams:)

What i did for that was proove first of all that EDC and ACB + ACE and BCD were congruent, and then i took my knowledge from that theorem (the one showing that opposide sides and opposite angles are equal) and basically said that because they were congruent that ED and AB + EA and DB were equal, and then prooved that angles AED = ABD and angles EAB = EDB

it took me like a full page to do

flump_master · 13-06-2011 03:54PM

Desire. wrote: »

So, for the second part all you had to say was that the opposite sides and opposite angles were equal?

kinda, you know that the top 2 triangles were congruent so then you could say the side two were congruent by SAS. Then it was just a matter putting the angles together to show that the opposite angles and sides were equal

scipsss · 13-06-2011 03:54PM

flump_master wrote: »

I got it wrong, for some reason i thought the distance was 28+7+7 so it threw my answer off, way heading for 100% too

thats how i did it too! i was sure thats how you got that

can anyone tell me how they did 1a ?

Indiego · 13-06-2011 03:55PM

scipsss wrote: »

thats how i did it too! i was sure thats how you got that can anyone tell me how they did 1a ?

I posted the method a little while ago

flump_master · 13-06-2011 03:57PM

scipsss wrote: »

thats how i did it too! i was sure thats how you got that can anyone tell me how they did 1a ?

from what I got doing it again you had half a circle on one end and half a cicle on the other and the straight part was 28. so your formula was: 2(pi)(7)+28(20) which you round up to get 100, mine was off by 28 because I added 7 on to either end twice..

Louise6 · 13-06-2011 04:04PM

I must say, i was delighted when i saw the circle theorem in question 3. I was looking at this thread last night and loads of people said it would come up. So i spent all night learning it, and THANK YOU

chatterboxxx95 · 13-06-2011 04:07PM

people asking a few pages back how to do the last part of six c max no that could have spent less than the mean it was 60+10+5=75, because people who spent 30-40 could hav spent less than 24, so your not told, so th MAX is 75

Grand paper overall, the way they phrased the questions was funny though, i thought the influence of project maths could be seen,

Dead happy with the theorems though!

chatterboxxx95 · 13-06-2011 04:09PM

chatterboxxx95 wrote: »

60+10+5=75, because people who spent 30-40 could hav spent less than 24,
)

* could have spent less than 34( or whatever the mean was, i dont remember;):)

Conchir · 13-06-2011 04:45PM

How did people do Q2. (c) (i)?

Basically, how do you get the slope of L when you have no coordinates on the line? I spent ages subbing numbers into the equation until I had 2 coordinates, but I wouldn't say that's how you were supposed to do it.

I still got the answer though, just worried about the method.

Desire. · 13-06-2011 04:52PM

Conchir wrote: »

How did people do Q2. (c) (i)?

Basically, how do you get the slope of L when you have no coordinates on the line? I spent ages subbing numbers into the equation until I had 2 coordinates, but I wouldn't say that's how you were supposed to do it.

I still got the answer though, just worried about the method.

-a/b is the simple method! :P

OsamaObama321 · 13-06-2011 04:55PM

Conchir wrote: »

How did people do Q2. (c) (i)?

Basically, how do you get the slope of L when you have no coordinates on the line? I spent ages subbing numbers into the equation until I had 2 coordinates, but I wouldn't say that's how you were supposed to do it.

I still got the answer though, just worried about the method.

I just subbed the co-ordinates in for the equation L then I got the slope
of that, I got -2/3 then I said that the product of the 2 slopes was supposed to be -1 so I got slope of 3/2 for K

King John The Last · 13-06-2011 04:59PM

Our (useless) teacher never told us about rearranging. A sub did it on our last week by chance.

Indiego · 13-06-2011 04:59PM

Ok, so i was just wondering if anyone could verify these answers?

1
A) 100

1- 51030 2- 17010 3- 2/3
C) 1- 7853.98 2- 3.14 3- 7856.34

2
A) (sqrt)58

1- C=9,4 D=5,7 E=1,4 2- 3/4 3- 44
C) 1- -x+7y-1=0

3
A) 26

2- 30, 80
C) 2- 4.7

4
A) 65

5
A) 8.66

1- 21.4 2- 61.5
C) 1- 34 2- 3.4

6
A) 16

3- 52
C) 2- 34 3- 75

:pac:

scipsss · 13-06-2011 05:16PM

to do the histogram could we just copy straight from the box on the sheet or did we need to make a grid and divide and multiply (some **** like that) ? :pac:

En · 13-06-2011 06:18PM

scipsss wrote: »

to do the histogram could we just copy straight from the box on the sheet or did we need to make a grid and divide and multiply (some **** like that) ? :pac:

Uhh, you had to obtain a base and from that, obtain a height.

The paper was a little harder than I expected, but I didn't mess up anything.
Took me 15 minutes at the end of the exam of pure staring at the question to figure out 2CII though, lol.
I did it on a graph, just to be safe, too.

robinrobin · 13-06-2011 06:19PM

flump_master wrote: »

from what I got doing it again you had half a circle on one end and half a cicle on the other and the straight part was 28. so your formula was: 2(pi)(7)+28(20) which you round up to get 100, mine was off by 28 because I added 7 on to either end twice..

Was the answer not 72(71.98229715)?
I saw the diagram as having the lengths that are not around the circles as being 28-(7+7) each. Did anyone else do this? I took away the half circle on either side in order to find the straight part?

En · 13-06-2011 06:23PM

robinrobin wrote: »

Was the answer not 72(71.98229715)?
I saw the diagram as having the lengths that are not around the circles as being 28-(7+7) each. Did anyone else do this? I took away the half circle on either side in order to find the straight part?

It told you in the question that the straight part was 28, and since there were two of the straight parts you have to add another 28, making it 100.

9Elliexx9 · 13-06-2011 06:24PM

KaBooom wrote: »

exactly what I got

me too!! Yay

9Elliexx9 · 13-06-2011 06:26PM

OsamaObama321 wrote: »

I just subbed the co-ordinates in for the equation L then I got the slope
of that, I got -2/3 then I said that the product of the 2 slopes was supposed to be -1 so I got slope of 3/2 for K

I think that's what I got too

robinrobin · 13-06-2011 06:30PM

is the straight part not 14 each though, because they overlap with the wheel by 7cm at each end?

9Elliexx9 · 13-06-2011 06:44PM

KaBooom wrote: »

what did everyone get for 6) c) (iii) ? The mean for the spending that I got was 42 or 43 euro, not too sure, then i added 60+10+5+13 (13 is half of 25 this is the part im not sure on) to find the people that could have spent less than the mean

EDIT: too late, its already been answered :L looks like i got that wrong then

Yeah I got forty something as my mean to , so then I added in the 40-50 section for the maximum possible amount of people ...

flump_master · 13-06-2011 06:51PM

robinrobin wrote: »

is the straight part not 14 each though, because they overlap with the wheel by 7cm at each end?

No, Its like theres two semicircles at each end of the belt and a big 28cm long rectangle in the middle. Thats how you use the formula

juniorcertlol · 13-06-2011 06:53PM

robinrobin wrote: »

is the straight part not 14 each though, because they overlap with the wheel by 7cm at each end?

dont think so mate, i did that first then realized i was wrong

u'll work it out if you look at the picture, cant explain it lol

robinrobin · 13-06-2011 07:02PM

Ahhhhhhh I see it now...thanks!
It's weird how that really confused me!

flump_master · 13-06-2011 07:07PM

No problem, it got me too for ages. Took a while of staring to figure it out and even then I made a stupid mistake. Ahh well, attempt marks ftw

robman60 · 13-06-2011 07:28PM

I really liked that paper, pretty sure I did well. In my usual fashion, I made a sign error on an a part (2a) which will lose me a couple of marks.

The two theorems I did last night were tipped, and both came up, ridiculously good luck. The accuaracy of the predictions makes me think someone's getting inside information. :cool:

The paper had elements that are present in the project maths plans too.

Also, my mother teaches in a school with project maths and she showed me the paper. Let's just say I'm very glad that our school isn't one of the pilot schools. The paper is really long and annoying, too wordy imo.

DazaC · 13-06-2011 07:31PM

KaBooom wrote: »

What Dazac said, i multiplied the mid interval value by the people and divided by the sum of the people, i just did it again there to make sure and i got 33.84 so I must of went wrong while typing it into the calculator -_- .. would i lose a lot of marks if i did everything right but just went wrong typing it in calculator? :eek:

If anything, you'll only lose 1 mark at the most. Theres marks going for each section of solving the answer so if it was marked out of 10 you'll get 8 or 9. :pac:

DazaC · 13-06-2011 07:34PM

robman60 wrote: »

I really liked that paper, pretty sure I did well. In my usual fashion, I made a sign error on an a part (2a) which will lose me a couple of marks.

The two theorems I did last night were tipped, and both came up, ridiculously good luck. The accuaracy of the predictions makes me think someone's getting inside information. :cool:

The paper had elements that are present in the project maths plans too.

Also, my mother teaches in a school with project maths and she showed me the paper. Let's just say I'm very glad that our school isn't one of the pilot schools. The paper is really long and annoying, too wordy imo.

I heard that the project maths paper was supposed to be depressing.

Looking at the paper we got, it was good luck for the questions. Although, there were a number of questions that they tried to trick you out on, especiaaly co ordinate geometry and area and volume part c.

But overall, a good paper:pac:

robman60 · 13-06-2011 07:44PM

Ya, it definitely was much harder than our papers, it's probably available on examinations if you want to compare.

KaBooom · 13-06-2011 07:45PM

DazaC wrote: »

If anything, you'll only lose 1 mark at the most. Theres marks going for each section of solving the answer so if it was marked out of 10 you'll get 8 or 9. :pac:

great! thanks

Desire. · 13-06-2011 07:54PM

Just looked at the Project Maths paper. It looks hard enough. Well, it would look harder anyway as we haven't done a lot of the stuff. Looks like timing could be an issue.

The Irish Blood Transfusion Service recently asked that people with blood group O- should
give blood as regularly as possible. Give a reason why this might be the case.

Is that a Maths question, really?

KaBooom · 13-06-2011 07:55PM

Just had a look at the Project Maths exam paper, doesnt look too hard. Just glanced through it but a good few questions are identical to ours, a few basic converting percentages to fractions theorems and trigonometry, everything we had to do, wheres the problem? The 17 questions does seem intimidating, but theyre pretty short and easy enough tbh..

KaBooom · 13-06-2011 07:56PM

Desire. wrote: »

Just looked at the Project Maths paper. It looks hard enough. Well, it would look harder anyway as we haven't done a lot of the stuff. Looks like timing could be an issue.

Is that a Maths question, really?

looks like its more writing than actual maths :L

Desire. · 13-06-2011 07:59PM

KaBooom wrote: »

Just had a look at the Project Maths exam paper, doesnt look too hard. Just glanced through it but a good few questions are identical to ours, a few basic converting percentages to fractions theorems and trigonometry, everything we had to do, wheres the problem? The 17 questions does seem intimidating, but theyre pretty short and easy enough tbh..

Probability.

I don't know... the whole thing just looks strange for a Maths exam, compared to what we're used to like.

And it's fifteen questions, not seventeen.

KaBooom · 13-06-2011 08:03PM

Desire. wrote: »

Probability.

I don't know... the whole thing just looks strange for a Maths exam, compared to what we're used to like.

And it's fifteen questions, not seventeen.

I did say I only glanced through

Yeah, they're phrased strangely, would probably catch me out the way they're asked. I'd say we'd get used to it after doing the course, but I guess thats where the problem is, been hearing people saying they only got their books a few months ago and they only had 1 sample paper

Slow Show · 13-06-2011 08:12PM

The one thing I really dislike about the look of Project Maths is them providing the space for answering...I need lots of paper to do maths, I probably use far more than most people so yeah, if I was to do that I'd definitely need lots of paper for rough work before filling in.

The paper doesn't look too bad, probably around the same difficulty as ours if we'd been learning that way for three years. I prefer our one though, I don't really think there's a whole lot wrong with the course as it is but OK then.

AllisonB · 13-06-2011 08:43PM

What did you guys get for (c) part (ii)..I got (-1,-4) not sure if it's right though..tell me it is

Desire. · 13-06-2011 08:45PM

AllisonB wrote: »

What did you guys get for (c) part (ii)..I got (-1,-4) not sure if it's right though..tell me it is

Is that question 2 or what?

AllisonB · 13-06-2011 08:45PM

oops sorry yes question 2

shadowninty · 13-06-2011 09:40PM

Slow Show wrote: »

I don't really think there's a whole lot wrong with the course as it is but OK then.

Ireland ranks consistently low in maths league tables which really drags our education rank down

robman60 · 13-06-2011 10:06PM

AllisonB wrote: »

What did you guys get for (c) part (ii)..I got (-1,-4) not sure if it's right though..tell me it is

Yes, that's correct!

Edit: My problem with Project Maths is how verbose some of the questions are. I mean, why can't it just be a circle, why does it have to be a public park with pretty flowers?!

yellowsky169 · 13-06-2011 10:36PM

I thought it was harder than paper 1 but it could have been worse... I knew what to do for 2cii but it wouldn't work out my point of intersection was -17/13 or something awful like that...:o made a stupid mistake in 6ciii and wrote down minimum:mad: Also, thought the thing about the boat and lbcl was hard got 22.8 and 2.2m/s I think I went wrong somewhere again there were square roots involved which is never good. Apart from those 3 delighted:D

chatterboxxx95 · 14-06-2011 10:27AM

shadowninty wrote: »

Ireland ranks consistently low in maths league tables which really drags our education rank down

i think though where we rank in maths is more to do with the teachers and teaching methods rather than the course! Ive had a fantastic maths teacher for the past 3 years and its given me a love for the subject, something i wouldnt have otherwise.
Looking at the project maths paper actually depressed me, (well obviously it looks weird as we didnt do that course, but still) because if that is what we are consigned to for ty and lc maths, its horrible.
Project maths may bring up international rankings, but what are figures when your taking away the love of a subject for people who actually would do science/maths/computers in college to try and get more people doing higher level and scoring better who have no interest in the subject at all!:eek:

*sorry, rant over for the day!*:pac:

Junior Cert 2011 : Maths Paper 2

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