[Mr M]

Now an appropriate time has elapsed, here are the answers for the non calculator examination of Monday 18th May 2009:

Edexcel GCSE Mathematics Linear 1380 Higher Tier

1a) Two Way Tables
1st row: 15 25 14 54
2nd row: 22 8 16 46
3rd row: 37 33 30 100 (3 marks)
1b) 37/100 or 0.37 or 37% (1 mark)

2a) Expressions
2x + 8y (2 marks)
2b) 2c + 4r (2 marks)

3a) Linear graphs
Missing values in table: -7, 1, 5 (2 marks)
3b) Straight line graph (2 marks)

4a) Substitution
k = 15 (2 marks)
4b) y = -7 (2 marks)

5a) Transformations
Correct rotation (2 marks)
5b) Translation 3 units to the right and 1 unit down (2 marks)

6a) Rectangle
The opposite sides of a rectangle are the same length (1 mark)
6b) x = 5.5 (2 marks)
6c) Perimeter = 57 cm (2 marks)

7a) Place value
15.456 (1 mark)
7b) 0.15456 (1 mark)
7c) 3220 (1 mark)

8a) Value for x
6 or -6 (2 marks)
8b) Prime factorisation
2 x 2 x 2 x 3 x 3 (2 marks)

9a) Plans and elevations
Square with side length 2 cm (2 marks)
9b) Sketch of solid shape (2 marks)

10) Water in barrel
320 seconds (3 marks)

11a) Length of a line
62.5 cm (1 mark)
11b) 63.5 cm (1 mark)

12) Shaded region
Construct angle bisector of BAC
Construct arc of circle 4 cm from B
Shade correct region (4 marks)

13a) Questionnaire
Question with a range of response boxes (2 marks)
13b) Question with a time period and response boxes (2 marks)

14) Estimating
28000 (or answer close to this) (3 marks)

15a) Standard form
(1 mark)
15b) (1 mark)

16a) Factorising
2x (2x - 3y) (2 marks)
16b) (x + 6) (x - 1) (2 marks)

17a) Cumulative frequency
Draw diagram (2 marks)
17b) Median = £240 (2 marks)
17c) The men spent more than the women by median average (1 mark)

18a) Circle theorems
54 degrees (2 marks)
18b) 27 degrees
Angle at the circumference is half the angle at centre (3 marks)

19a) Straight lines
x = 2, y = 3 (1 mark)
19b) y = 0.5x + 4 (2 marks)

20a) Inequalities
t < 5.5 (2 marks)
20b) 5 (1 mark)

21) Proportion
540 (4 marks)

22) Histogram
Bars of frequency density 0.8, 1, 1.6, 2, 1.2 (4 marks)

23a) Probability tree diagram
0.5, 0.3, 0.2 written in four places (2 marks)
23b) 0.25 (2 marks)

24a) Congruent triangles
Valid proof (3 marks)
24b) Valid proof that perpendicular bisects base (2 marks)

25a) Changing the subject
(3 marks)
25b) (2 marks)

26a) Graph transformations
y = f(x-4) (2 marks)
26b) Stretched in y direction by s.f. 3 and in x direction by s.f. 0.5 (2 marks)

[m0man]

Wow I think I got near 100%
just for 25b) i got u =(1/f - 1/v)to the power -1

[tsr4life]

you got the answers for iGCSE?

[Palladio]

Can see 10 marks which I've lost... really hope I lose no more.

I revised absolutely everything apart from what came up.

[hannah_xo]

thanks so much for these. are they 100% correct?

aghhh. for 16b) i got that that answer in my working, but in the answer space i actually gave the values of x. like x = -6 or x = 1. that's annoyingg. and for the 63cm line question, for the highest possible value i put 63.49(recurring) because i would of thought 63.5 would round up to 64?

[written on my heart]

agghhh i completely flopped.

[supercoolfred]

Are you sure ALL of these are correct?
For 18b), I am nearly 100% sure it was 54 due to angles in the same segment.

For 25 A) I got 7/10. Would I get any method marks?

Do you remember what the question for 8 A) was as well?

Thanks a load though!!!!

[jack1865]

i think i got around 86%, soo an a* is still on for me!

[supercoolfred]

Also, do you by any chance have grade boundaries? (Or even provisional ones?)

[Avacadro]

wow, I done incredibly crap!
But I think I still managed around 86-90% touch wood

[Avacadro]

I put for the penultimate question y=f(x-4)*2 (dont ask)- will I still get 1 mark?

[fubsadoo]

Originally Posted by hannah_xo

thanks so much for these. are they 100% correct?

aghhh. for 16b) i got that that answer in my working, but in the answer space i actually gave the values of x. like x = -6 or x = 1. that's annoyingg. and for the 63cm line question, for the highest possible value i put 63.49(recurring) because i would of thought 63.5 would round up to 64?

I think they might give you the mark for that at GCSE, depends how generous they're feeling, but the convention is to just use 63.5 because it's much easier to work with than 63.45 recurring.

[Mr M]

Originally Posted by guitar1351

Hi, for 25a I put down 1 3/7 instead of 10/7. Would that matter because they have the same value or would I lose a mark?

thats fine

[Mr M]

Originally Posted by hannah_xo

thanks so much for these. are they 100% correct?

aghhh. for 16b) i got that that answer in my working, but in the answer space i actually gave the values of x. like x = -6 or x = 1. that's annoyingg. and for the 63cm line question, for the highest possible value i put 63.49(recurring) because i would of thought 63.5 would round up to 64?

63.49 recurring is equal to 63.5 (not approximately equal, they are the same number). It will be marked correct.

[Mr M]

Originally Posted by supercoolfred

Also, do you by any chance have grade boundaries? (Or even provisional ones?)

No grade boundaries have been agreed yet. This comes after a lot of the scripts have been marked.

[Mr M]

Originally Posted by Avacadro

I put for the penultimate question y=f(x-4)*2 (dont ask)- will I still get 1 mark?

yes

[Mr M]

Originally Posted by supercoolfred

Are you sure ALL of these are correct?
For 18b), I am nearly 100% sure it was 54 due to angles in the same segment.

For 25 A) I got 7/10. Would I get any method marks?

Do you remember what the question for 8 A) was as well?

Thanks a load though!!!!

25a) probably two marks

8a was 2x squared = 72 - give one value for x

[Mr M]

Originally Posted by tsr4life

you got the answers for iGCSE?

no

[fubsadoo]

How do you know all the answers?

[Mr M]

Originally Posted by fubsadoo

How do you know all the answers?

im magical