Mathematics Extension 1 Predictions/Thoughts (1 Viewer)

[Aaryan123]

how many people do you think will full mark this exam? would 100 100 guarantee sr?

 

[carrotsss]

how many people do you think will full mark this exam? would 100 100 guarantee sr?

definitely guaranteed state rank, first in course I harder to predict like last year no one got 100 in 3u but all it takes is like 2 people being really cracked and then 100 stops being guaranteed first

 

[scaryshark09]

how many people do you think will full mark this exam? would 100 100 guarantee sr?

why, did you get full?

 

[Aaryan123]

why, did you get full?

i pray fingers crossed

 

[Interdice]

I do Ext 1 + Advanced.

Lets say my HSC mark is 80. Let's say my internal mark is 66.

(80+66)/2 = 73

73 is a nice whole number. However since I'm doing 1 unit of extension, I'll get 36.5. Will it get brought up to 37, or brought down to 36?

 

[Trebla]

I do Ext 1 + Advanced.

Lets say my HSC mark is 80. Let's say my internal mark is 66.

(80+66)/2 = 73

73 is a nice whole number. However since I'm doing 1 unit of extension, I'll get 36.5. Will it get brought up to 37, or brought down to 36?

It will "visually" appear as 37/50 on your report. However, the underlying mark is actually 36.5/50 (i.e. it is treated as lower than someone who actually got 37/50).

 

[Interdice]

It will "visually" appear as 37/50 on your report. However, the underlying mark is actually 36.5/50 (i.e. it is treated as lower than someone who actually got 37/50).

Would this also be true for if I got a 83 extenral and a 78 interna. Would my mark be 80.5 instead of 81? Assuming a 2 unit subject

 

[Trebla]

Would this also be true for if I got a 83 extenral and a 78 interna. Would my mark be 80.5 instead of 81? Assuming a 2 unit subject

Yes. The exact mark is stored in the database, but in the HSC report it is displayed as a rounded whole number.

 

[Jamesssss10]

I do Ext 1 + Advanced.

Lets say my HSC mark is 80. Let's say my internal mark is 66.

(80+66)/2 = 73

73 is a nice whole number. However since I'm doing 1 unit of extension, I'll get 36.5. Will it get brought up to 37, or brought down to 36?

But what if you were just of the next band, a 69 for example, would it show as 35 and band e2? Doesn’t make sense

 

[Interdice]

But what if you were just of the next band, a 69 for example, would it show as 35 and band e2? Doesn’t make sense

The difference would be minuscule. not even worth thinking about

 

[scaryshark09]

on your results page, after alignment, its rounded to the nearest whole number (or nearest even number ig for 3u kids who don't do 4u). this is purely just for display purposes

however, UAC gets given marks to 4dp, so rounding makes no difference for your atar

in regards to the 80 external, and 66 internal, your mark would be displayed as 37/50 for a 3u kid, however this rounding up is not a benefit when it comes to atar

 

[harrowed2]

matrix solutions: https://www.matrix.edu.au/wp-conten...MATHS_EXT1_HSC_Solutions_MATRIX-EDUCATION.pdf

I can't make this link work

 

[carrotsss]

I can't make this link work

2023 HSC Maths Ext 1 Exam Paper Solutions

You've found the 2023 HSC Maths Extension 1 Paper Solutions complete with full explanations! Read here to see how you went.

www.matrix.edu.au

 

[harrowed2]

2023 HSC Maths Ext 1 Exam Paper Solutions

You've found the 2023 HSC Maths Extension 1 Paper Solutions complete with full explanations! Read here to see how you went.

www.matrix.edu.au

Thank you!

 

[Luukas.2]

I've heard various stories about how many marks this would get - everything from 0 to full marks.

I didn't go to NESA's HSC feedback day today which was held at UTS - but I heard that at that the HSC markers confirmed it would get full marks.

Arguments for saying stick to the syllabus is seriously weakened when many students have not been in schools in NSW for 13 years, but rather in later years come to Australia to do the HSC - when they have already been educated elsewhere in determinants, vectors including cross product, matrices etc.

So when they see a question like this it is obvious to them to use the cross product - and now according to the HSC markers would not be penalised for doing so - especially when the question said "or otherwise".

They could have just come from Victoria, the VCE specialist maths course includes vector cross products!

 

[scaryshark09]

So do you think it's fair to give full marks for the obviously much shorter solution - compared to these which obviously take much longer time and effort?

View attachment 42564
(from nesa mg)

yeah no, i dont think that's fair
the simpler solution (3 posts ago) doesn't assess anything from the actual NSW syllabus pretty much. theres no way someone should be getting 3/3 for that.

 

[epicmaths]

Love the cross products solution - another reflection of how poorly conceived the new HSC syllabus is, bring back circle geometry!

 

[Luukas.2]

@tywebb, the cross-product solution is mathematically flawless. The question did not include any direction that the cross-product method contravenes. I struggle to see any reason why it should be penalised - and especially if the solution included a statement as to what the cross-product is and how the solution thus follows. The question did strike me as strange, in that I saw multiple 'otherwise' approaches before I recognised the hence approach being suggested, but students who can see alternatives that weren't considered in advance shouldn't be penalised for greater knowledge or insight than was anticipated.

Having said that, the following question was on the 2021 MX2 HSC, q15(d), and worth 2 marks:

​

Would you give full marks for the following solution? It is valid, but also surely not what the examiners intended...

Fermat's Last Theorem, which was proved in 1999 by Andrew Wiles, states:





​

In general, questions being solvable by valid methods beyond the syllabus are a potential problem that should be considered / addressed while drafting the exams, not as a marking problem after the exams have been sat.

 

[Luukas.2]

No because it wasn't. It was proved in 1994 and published in 1995.

My mistake, I mis-remembered the year.

 

[Luukas.2]

But generally if one can give a reference for a theorem that was proved, one can go on to use it to prove other things without having to prove it again. That's how maths works.

Maybe a more succinct solution would simply be

View attachment 42566
follows as a corollary of Fermat's Last Theorem

Reference:

Wiles, Andrew (1995). "Modular elliptic curves and Fermat's Last Theorem" Annals of Mathematics. 141 (3): 443–551.

This I wouldn't give 2 marks for, because Fermat's Last Theorem only establishes the result for integers ... but yes, a succinct version that shows separately should be sufficient.