Hey there! Sign in to join this conversationNew here? Join for free

Edexcel IGCSE Mathematics A - Paper 3H - 2016 - Unofficial Mark Scheme Watch

    Offline

    0
    ReputationRep:
    For question 19 ( circle theorm ) do we need to explain each step?
    Offline

    1
    ReputationRep:
    Could someone give me a rough list of topics that were on the paper, I sat mine in janurary and am trying to help predict what will be on 4H
    Offline

    9
    ReputationRep:
    (Original post by likeliverpool)
    Question 20 and 21 are wrong. My maths teacher grabbed an exam herself and did all the questions. The ones on this mark scheme is what I put in the exam, which are wrong.

    Question 20:
    She explained that although the question said '4.5 (rounded to the nearest cm)' you were not supposed to put 4.55 which would have given you 1637 if you had carried on. Rather it should have been 4.75.
    - I cant remember the real answer though

    Question 21:
    -I remember the answer being as 16/81

    My math teacher could be wrong though, but I highly doubt it
    Ok, I will once again post why your teacher is wrong:

    Q20)
    They said that 4.5cm was to the nearest 0.5cm, NOT 0.1cm. Therefore, adding half of 0.5, which is 0.25, to 4.5, we get 4.75 cm.
    Upper bound of the side of the cube was 4.75 cm=47.5mm.
    Lower bound of the radius of the sphere was 2.5mm.
    Therefore the maximum number can be figured out by dividing the max volume of the cube by the minimum volume of the sphere.
    1=Max volume cube = 47.5^3
    2=Max volume sphere = 4/3 Pie R^3 = 4/3*pie*2.5^3
    Divide 1 by 2 and you get 1637.465632.
    However you cannot have 0.465632 of a sphere, so there are 1637 spheres which can be made from the cube.

    As I have said, that will only lose you two or three out of five, most likely only two.

    Q21)
    This is the working:
    The only ways to pick out three of the cards and get a total of 6 were to pick out a 1, 2 and 3; or to pick out 2,2 and 2.
    The former can be achieved by picking them out in 1 of six orders:
    1,2,3
    1,3,2
    2,3,1
    2,1,3
    3,1,2
    3,2,1
    To find out the probability of each of these scenarios, this is how you do it:
    (2/9)*(3/8)*(4/7) = 1/21
    Since there are 6 of them, multiply 1/21 by 6 = 2/7 (which is what you did)
    However you forgot that by picking out three 2's, a total of six could be achieved.
    The probability of this is (3/9)*(2/8)*(1/7)=1/84
    1/84 + 2/7 = 25/84
    Offline

    9
    ReputationRep:
    (Original post by Latina56)
    Could someone give me a rough list of topics that were on the paper, I sat mine in janurary and am trying to help predict what will be on 4H
    Topic List for 4H
    Angle rules (corresponding angles, interior angles etc.)
    Alternate Segment Theorem
    Indices
    Transformations
    A hard algebraic simplification question
    Surds
    Quadratic Formula
    Inequalities – inequality lines and graphs(shade in the correct section)
    Vectors – Proof of straight line
    Simultaneous equations
    Function notation – inverse function, domain,range
    Median, mean, mode, range
    Compound interest and percentages
    Proportionality
    Bearings
    Line Bisectors and angle bisectors
    Construction of shapes
    Histograms
    Interior angles, exterior angles, number ofsides
    Standard Form
    Recurring Decimals
    Prime Factors
    Venn Diagrams
    Chords and Sectors
    Sin rule trig
    Offline

    1
    ReputationRep:
    (Original post by Martins1)
    Topic List for 4H
    Angle rules (corresponding angles, interior angles etc.)
    Alternate Segment Theorem
    Indices
    Transformations
    A hard algebraic simplification question
    Surds
    Quadratic Formula
    Inequalities – inequality lines and graphs(shade in the correct section)
    Vectors – Proof of straight line
    Simultaneous equations
    Function notation – inverse function, domain,range
    Median, mean, mode, range
    Compound interest and percentages
    Proportionality
    Bearings
    Line Bisectors and angle bisectors
    Construction of shapes
    Histograms
    Interior angles, exterior angles, number ofsides
    Standard Form
    Recurring Decimals
    Prime Factors
    Venn Diagrams
    Chords and Sectors
    Sin rule trig
    Thankyou! That is very helpful, just to clarify, are these your predictions for 4H or are they what was on 3H?
    Offline

    9
    ReputationRep:
    (Original post by Latina56)
    Thankyou! That is very helpful, just to clarify, are these your predictions for 4H or are they what was on 3H?
    This is a topic list of things which were not on paper 3H
    Offline

    2
    ReputationRep:
    (Original post by Martins1)
    Here is my working supporting the 188 answer.
    The formula of area of triangle need the perpendicular hight how did you get the hight ?
    Offline

    2
    ReputationRep:
    (Original post by WhiteX)
    The formula of area of triangle need the perpendicular hight how did you get the hight ?
    pythagorus theorem a2 + b2 = c2
    Offline

    9
    ReputationRep:
    (Original post by WhiteX)
    The formula of area of triangle need the perpendicular hight how did you get the hight ?
    The bottom of the sheet, where I figure out AF - AF is the perpendicular height.
    Offline

    2
    ReputationRep:
    (Original post by BOBQ)
    pythagorus theorem a2 + b2 = c2
    isnt pythagorus only used when there is the hight is 90 deg ?
    Offline

    2
    ReputationRep:
    (Original post by Martins1)
    Topic List for 4H
    Angle rules (corresponding angles, interior angles etc.)
    Alternate Segment Theorem
    Indices
    Transformations
    A hard algebraic simplification question
    Surds
    Quadratic Formula
    Inequalities – inequality lines and graphs(shade in the correct section)
    Vectors – Proof of straight line
    Simultaneous equations
    Function notation – inverse function, domain,range
    Median, mean, mode, range
    Compound interest and percentages
    Proportionality
    Bearings
    Line Bisectors and angle bisectors
    Construction of shapes
    Histograms
    Interior angles, exterior angles, number ofsides
    Standard Form
    Recurring Decimals
    Prime Factors
    Venn Diagrams
    Chords and Sectors
    Sin rule trig
    thanks those were helpful i'll focus on them i think direct proportion and inverse will come up too
    Offline

    9
    ReputationRep:
    (Original post by WhiteX)
    thanks those were helpful i'll focus on them i think direct proportion and inverse will come up too
    Yeah, I agree - i have proportionality in my list
    Offline

    2
    ReputationRep:
    (Original post by WhiteX)
    isnt pythagorus only used when there is the hight is 90 deg ?
    yes the triangle was divided into 2 smaller 90 degree triangles
    Offline

    0
    ReputationRep:
    (Original post by BOBQ)
    you had to give the answer in the form ax + bx = c

    The equation for the line was Y = 3/4X - 4.75

    That multiplied by 4 on each side gave it in the correct form

    which was 4Y - 3X = -19
    what about if you put -3/4X - X = -4.75
    Offline

    0
    ReputationRep:
    Hey,
    4.5 was rounded to the nearest 0.5 not 0.1 so it wasn't 4.55- I think it was 4.75?
    Offline

    0
    ReputationRep:
    (Original post by Martins1)
    Ok, I will once again post why your teacher is wrong:

    Q20)
    They said that 4.5cm was to the nearest 0.5cm, NOT 0.1cm. Therefore, adding half of 0.5, which is 0.25, to 4.5, we get 4.75 cm.
    Upper bound of the side of the cube was 4.75 cm=47.5mm.
    Lower bound of the radius of the sphere was 2.5mm.
    Therefore the maximum number can be figured out by dividing the max volume of the cube by the minimum volume of the sphere.
    1=Max volume cube = 47.5^3
    2=Max volume sphere = 4/3 Pie R^3 = 4/3*pie*2.5^3
    Divide 1 by 2 and you get 1637.465632.
    However you cannot have 0.465632 of a sphere, so there are 1637 spheres which can be made from the cube.

    As I have said, that will only lose you two or three out of five, most likely only two.

    Q21)
    This is the working:
    The only ways to pick out three of the cards and get a total of 6 were to pick out a 1, 2 and 3; or to pick out 2,2 and 2.
    The former can be achieved by picking them out in 1 of six orders:
    1,2,3
    1,3,2
    2,3,1
    2,1,3
    3,1,2
    3,2,1
    To find out the probability of each of these scenarios, this is how you do it:
    (2/9)*(3/8)*(4/7) = 1/21
    Since there are 6 of them, multiply 1/21 by 6 = 2/7 (which is what you did)
    However you forgot that by picking out three 2's, a total of six could be achieved.
    The probability of this is (3/9)*(2/8)*(1/7)=1/84
    1/84 + 2/7 = 25/84
    I see, thanks. since I got 2/7 and used 4.55. Will I only lose 4-5 marks out of the paper?
    Offline

    1
    ReputationRep:
    (Original post by _Xenon_)
    This is the Unofficial Mark Scheme for the Edexcel IGCSE Mathematics A HIGHER TIER exam today. If you find any errors, please let me know.

    Question 1
    Spoiler:
    Show
    1. Ingredients question.
    (a) 750
    (b) 30 muffins
    Question 2
    Spoiler:
    Show
    2. t is the total number of pens.
    x is a small box.
    y is a big box.
    There are 4 pens in the small boxes and 10 pens in the big ones. I believe the answer was: t = 4x+10y (3 marks)
    Question 3
    Spoiler:
    Show
    3. 2.95
    Question 4
    Spoiler:
    Show
    4a.) 6 and 12
    4b.) 2, 3, 4, 6, 8, 9, 10, 12, 14
    Question 5
    Spoiler:
    Show
    5. Sketch graph.
    (-2,11) & (3/4) / (y = 3x - 5)
    Question 6
    Spoiler:
    Show
    6. Show that questions...

    Example can be provided, just ask.
    Question 7
    Spoiler:
    Show
    7a.) y(3y+2)
    Question 8
    Spoiler:
    Show
    8. 10.7
    Question 9
    Spoiler:
    Show
    9. 52%
    Question 10
    Spoiler:
    Show
    10. 10.7 degrees (?)
    Question 11
    Spoiler:
    Show
    11. Cumulative frequency (add them up as you go along for the table and for plotting use the upper value and the cumulative frequency to plot point then join with smooth curve.

    Interquartile range = UQ-LQ
    Question 12
    Spoiler:
    Show
    12. x = 7, y = -3
    Question 13
    Spoiler:
    Show
    13. Rearrange in the form ax+by=c
    Question 14
    Spoiler:
    Show
    14. Velocity question, differentiate.

    V = 6t2-24t+(7 or 9)

    2 seconds.
    Question 15
    Spoiler:
    Show
    15. 102.4cm
    Question 16
    Spoiler:
    Show
    16. Volume of the vase was 102 cm3.
    Working out:
    ASF =
    LSF =
    VSF =
    = 24.3cm3 (3 s.f.)
    Question 17
    Spoiler:
    Show
    17. x = 8
    Question 18
    Spoiler:
    Show
    18. Rearrange.
    k = 3m+1 (?)
    Question 19
    Spoiler:
    Show
    19. 63 degrees (circle theorems question)
    Question 20
    Spoiler:
    Show
    20. 1637 spheres
    Question 21
    Spoiler:
    Show
    21. 25/84
    Question 22
    Spoiler:
    Show
    22. 188cm2
    Do you have answer to the simplify the 28x5etc one
    Offline

    9
    ReputationRep:
    (Original post by BOBQ)
    yeah i think it was 4.75,

    what would you get if you put 4.55 but did everything else correctly
    two or three out of 5.
    Offline

    0
    ReputationRep:
    Ngl I put 4.55 and only realised after the exam, I think seen as we got the method correct we may get most apart from the mark for the final answer and the one for figuring out the right upper bound, so 3/5?
    Offline

    0
    ReputationRep:
    Can someone make a list for the things that weren't on this and the things that were for paper 4h. Thanks
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    Would you like to hibernate through the winter months?
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

    Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

    Quick reply
    Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.