Edexcel Gcse Mathematics Linear 1ma0 Best Buys Answers

Mr M's Edexcel GCSE Mathematics 1MA0 Higher Tier Paper 1 Answers June 2015

1. Stem and leaf diagram

(a)

15 | 6 9
16 | 4 5 7 7 8 9
17 | 2 3 6 6 8 9
18 | 0 2 3 8
19 | 0 2

Example of a key: 15 | 6 = 156 cm (3 marks)

(b) 15% (2 marks)

2. Algebra

(a) 36 (1 mark)

(b) x = 2.5 (2 marks)

3. Questionnaire

How many times per week do you use the BMX track in town?

0 - 1

2 - 3

4 - 5

more than 5 (2 marks)

4. Plants

Kirsty's Plants costs £59.75 and Hedge World costs £63. Tom should buy from Kirsty's Plants. (5 marks)

5. Cheese cuboids

x = 12 (3 marks)

6. Scatter graph

(a) Negative correlation OR as the age increases the price decreases (1 mark)

(b) Draw line of best fit to find £6600 approx (2 marks)

7. Transformations

(a) Triangle with vertices at (-3, 3), (-3, 4) and (-1, 4) (2 marks)

(b) Reflection in the line y = x (2 marks)

8. Algebra

(a) (2 marks)

(b) (1 mark)

9. Pencils and pens

3 boxes of pencils
8 packets of pens (3 marks)

10. Conservatory

Yes Mary has £7 more than she needs (5 marks)

11. Dice game

(a) $\frac{1}{5}$ (2 marks)

(b) £10 (3 marks)

12. Parallel lines

Angle BEF = 60 degrees (alternate angles are equal)

Angle REF = x (alternate angles are equal)

x = 40 degrees (angles at a point on a straight line sum to 180 degrees) (4 marks)

13. Rectangles and triangles

48 cm (5 marks)

14. Speed

54 mph (3 marks)

15. Coordinate geometry

(a) (3, 6.5) (2 marks)

(b) No it doesn't as it doesn't lie on the line $y=\frac{1}{2}x+5$ (3 marks)

16. Cumulative frequency

(a) 4, 20, 56, 80, 94, 100 (1 mark)

(b) Plot graph correctly using endpoints (2 marks)

(d) 18 approx (2 marks)

17. Pentagon and square

18 degrees (4 marks)

18. Graphing inequalities

You should end up with a small triangle as R (4 marks)

19. Sweets

(a) Show quadratic equation (3 marks)

(b) 10 (3 marks)

20. Changing the subject

$a=\frac{4p-5}{3+p}$ (4 marks)

21. Algebraic proof

Correct proof (3 marks)

22. Indices and surds

(a) $\frac{1}{8}$ (1 mark)

(b) $k=\frac{3}{2}$ (1 mark)

23. Grain

$\frac{14}{3}$ (5 marks)

24. Graph transformations

(a) (i) (0, 5) (1 mark)

(ii) (3, 10) (1 mark)

(iii) (1, 5) (1 mark)

(b) Translation 4 units in the negative y direction (1 mark)

I've deleted my predicted Paper 2 as it was made up from old Edexcel past paper questions and I am concerned that it might be a breach of copyright to use them without permission.

There are lots of other mock Paper 2s on the internet. Here's a couple:

http://www.mathsgenie.co.uk/resources.html

http://justmaths.co.uk/2015/06/05/best-guess-june-2015/

Anyone else listen to drum and bass while reading that?

Shouldn't 8c, be P to the power of 6?

Thank you Mr M for doing this - i highly appreciate it!!

What was q 21 like? I don't remember it :/

(Original post by SAguilar98)
What was q 21 like? I don't remember it :/

You were asked to prove that x = 0.045454545... = 1/22 algebraically

For question 10 I did everything right apart from I got the discount wrong and put no how many marks would this be. And also for 18 I got 2 lines correct but not third so got a bigger triangle so how many is this. Thanks for the help😊

(Original post by Mr M)
You were asked to prove that x = 0.045454545... = 1/22 algebraically

Oh I see, was the fraction 45/990 so it cancels down to 1/22?

(Original post by SAguilar98)
Oh I see, was the fraction 45/990 so it cancels down to 1/22?

That's a possible way to do it.

how many marks would you get if you wrote 15 and 40 for the pens question 9?

Aiming for a C here, I can see I got some questions right, but made some stupid mistakes! Hopefully for the Calc I can make it up and get atleast half

Hiya,

Thanks for this it's really helpful! On Q5 I forgot the units - would it just be 1 mark to lose?

Also, On Q15 I found that AB and BD did not have the same gradient and therefore D could not be on the same straight line - would I lose a mark for not using y=mx+c?

Thanks

for the k=5^3/2, if I wrote 5^3/2 in the answer line would i lose marks?
and if I wrote both negative correlation and the increases/decreases would I lose marks?

For 18, does it matter if you labelled it R? I plotted the points, also, was the triangle on the top left?

(Original post by ydnmz20)
how many marks would you get if you wrote 15 and 40 for the pens question 9?

Full marks.

Q. 22 b) Instead of wriin k= 3/2
i wrote the full number so 5^3/2
but in my calculations its clear that i was referring to the k= 3/2

its a one mark question so would i get the mark?

(Original post by hannah4475)
Hiya,

Thanks for this it's really helpful! On Q5 I forgot the units - would it just be 1 mark to lose?

Also, On Q15 I found that AB and BD did not have the same gradient and therefore D could not be on the same straight line - would I lose a mark for not using y=mx+c?

Thanks

You don't need (or even want) units for Q5 - it asks for the value of x.

Nice method for Q15 - full marks.

also on the stem and leaf i did the key but didnt right cm
would i lose a mark?