How to do Vectors A/A* GCSE Maths revision Higher level worked exam questions (inc straight lines)

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  • Опубліковано 24 гру 2024

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  • @bongobliss5795
    @bongobliss5795 5 років тому +9

    5 years and still saving lives , thanks

  • @RawMaths
    @RawMaths  11 років тому +3

    Thank you for your response, it is difficult to explain in the these comments but i will try:-
    CD would be 1/3 of AD but we dont know AD we know AC and the ratio tells us that AC is twice CD (2:1) so if we know AC = 2x + 4Y then CD = x+2y
    So the whole of AD is AC+CD = 3x + 6y

  • @FluorescentM
    @FluorescentM 11 років тому +2

    Thank you so much! I've got my exam tomorrow and this has helped a lot as i didn't understand the proof :D

  • @RawMaths
    @RawMaths  11 років тому

    If you are talking about the question that starts around 5m20s in (3rd one) then it is because they are not parts of the same line they are separate lines. So the whole of ZY is in the ratio of 3:2 with WX so ZY is infact 1.5 times WX. Often these vector questions with ratios are talking about parts of the same line where you would add the 3 and 2 to make 5 but because they are separate lines you don't do that for this question.

  • @jordanwuy
    @jordanwuy 10 років тому +7

    This was incredibly helpful and I feel much more confident with vectors now.

  • @saadpatel2734
    @saadpatel2734 6 років тому

    Really helpful
    I didint understand in school
    Here i fully understood , i printed sheets on vectors and practised
    im now confident to face any vector question

  • @learn2bake
    @learn2bake 10 років тому +31

    Thanks so much. Incredibly clear and helpful.

    • @RawMaths
      @RawMaths  10 років тому +3

      Thanks for your comment.

  • @jibreelahmed6503
    @jibreelahmed6503 8 років тому +2

    At 07:27 how do you work out -s +3/2 a

  • @yasirtaher0919
    @yasirtaher0919 5 років тому +1

    I watched all 31 minutes of the video and hope it helps for my exam

  • @trentzhang6137
    @trentzhang6137 9 років тому +3

    Explained it better than my maths teacher :)

  • @sawsansalah3854
    @sawsansalah3854 5 років тому +5

    I can't thank you enough for this video. Thank you so much sir!

  • @Minasiu
    @Minasiu 9 років тому +7

    at 4:50, isnt it supposed to be 1/3(2x+4y) ?

    • @RawMaths
      @RawMaths  9 років тому +9

      Mina s Thanks for you comment, this is a common question and I have answered it before, this is my response from before
      it is difficult to explain in the these comments but i will try:-
      CD would be 1/3 of AD but we dont know AD we know AC and the ratio tells us that AC is twice CD (2:1) so if we know AC = 2x + 4Y then CD = x+2y
      So the whole of AD is AC+CD = 3x + 6y

    • @Minasiu
      @Minasiu 9 років тому +1

      RawMaths Thank you :)

    • @thenight8798
      @thenight8798 6 років тому

      CD is 1/3 of AD so 1/3(3x+6y)=x+2y . so basically ac is just double cd so u half ac.

    • @haroonsiddiqui8901
      @haroonsiddiqui8901 6 років тому

      correct

    • @rajendramisir3530
      @rajendramisir3530 6 років тому

      +The Night Regarding AC:CD is 2:1. AC=2/3(AD) which is represented by vector AC=2x+4y. It follows that CD=1/3(AD) which is represented by vector CD=1/2 of vector AC=1/2(2x+4y)=x+2y. Note: (1/3=1/2(2/3)).
      Another way to reason this ratio through is: 2/3 of AD represents 2x+4y. It follows that 1/3 of AD represents x+2y. Which means 3/3 or AD represents 3x+6y. So 3/3(AD) equals 2/3(AD)+1/3(AD) which represents 3x+6y= (2x+4y) + (x+2y) . Note: You knew vector AC and not vector AD (part of a whole). So, this sort of reasoning is needed in this case to calculate vector AD.

  • @gymnast21dancer
    @gymnast21dancer 10 років тому

    This has helped me so much! I have been looking everywhere for a clear, simple vector video. THANKYOU!

    • @RawMaths
      @RawMaths  10 років тому

      Thanks for the comment it is great to get feedback and don't forget to spread the word to your friends ;)

  • @priya200328
    @priya200328 4 роки тому

    On (24:33) you said OP is 3a but because its divided into 1/3 and 2/3 why isn't it just a?

  • @RawMaths
    @RawMaths  10 років тому

    Sorry Daniel cant reply to your comment but no a+b would be incorrect. Could it be that you didn't half the AB?

  • @atifahidari9576
    @atifahidari9576 9 років тому +2

    for the trapezium, in the first question, does it matter which direction you got to find mn? could i go right then up then left instead of left up then right? will it give me the same answer?

    • @jackh9946
      @jackh9946 5 років тому

      Auria Helen it would give you the same answer but it would be a lot harder to do. Just in case you’re still stuck after 3 years :)

  • @marssgrl
    @marssgrl 8 років тому +2

    at 16:45,,,,, where did 3 1/5b come from ??? o.o

  • @bixstar1469
    @bixstar1469 7 років тому

    21:34
    I got: NR = 2PN
    does different answers from different routes count or are they wrong?

    • @RekhaKMathsSolutions
      @RekhaKMathsSolutions 6 років тому

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  • @ahkyinnart9435
    @ahkyinnart9435 10 років тому +1

    This is really, really, really, really HELPFUL!!
    Thank you for your hard work! :)

  • @josephineturner2099
    @josephineturner2099 7 років тому

    Thanks for the video. I have my GCSEs in a few weeks and this was the only topic that I didn't understand but now I do.

    • @Alawneh
      @Alawneh 6 років тому

      how did they go?

  • @angelakoulouri3016
    @angelakoulouri3016 6 років тому

    FANTASTIC. I didn't get it at all before this.

  • @SlaveOfTheCreator
    @SlaveOfTheCreator 6 років тому

    3:05 for question b: Can the answer be -a+b?

  • @leah38521
    @leah38521 9 років тому +1

    Hi, at 8:54 shouldn't LU be 1/3U as its 1/4 of OU and not U

    • @RawMaths
      @RawMaths  9 років тому

      leah38521 Thxs for the comment but... as u = OU and OL is 3/4 of OU that means there is 1/4 left so 1/4u

    • @elliotsmith4264
      @elliotsmith4264 9 років тому

      RawMaths But u is not OU, Leah would be correct, you would take a third of u

    • @RawMaths
      @RawMaths  9 років тому

      Elliot Smith Hmm looks to me that it is says it is on the first line of the question
      In the diagram OU = u

    • @elliotsmith4264
      @elliotsmith4264 9 років тому

      RawMaths Yep fair enough aha, great videos by the way

    • @RawMaths
      @RawMaths  9 років тому

      Thxs :)

  • @Amber-bq6mw
    @Amber-bq6mw 9 років тому

    For the third question 'On a trapezium', why is vector ZY 3/2s and not 3/5s as the total of the ratio (3:2) is 5, so shouldn't 3 be written out of the total sum of the ratio??

    • @RawMaths
      @RawMaths  9 років тому +1

      Amber Karim the ratio is not for one length but for the two separate lengths WX and ZY (you add the ratio when you are trying to split one thing into a ratio, but this one is different). This is more like a question such as the ratio of Red:Blue is 3:2 if you have 2 Blue you must have 3 Red so if Blue is s then Red would be 1.5s

    • @Amber-bq6mw
      @Amber-bq6mw 9 років тому

      Oh i think i get it now!! Thanks. :)

  • @cubong9826
    @cubong9826 7 років тому

    for the penultimate questions could you instead work out EF and DE and say that they both share common point E?

  • @ahmedhady4335
    @ahmedhady4335 8 років тому

    In 14:12 isn't vector RP= b-a ??

    • @RawMaths
      @RawMaths  8 років тому

      +Ahmed Hady Thxs for your question, but RP is the opposite direction of PR so all signs would be reversed. As PR = a+b RP = -a -b

    • @ahmedhady4335
      @ahmedhady4335 8 років тому

      +RawMaths Thank you very much for answering my question! :) I get it now ^_^ Thank you again!

  • @blackham7
    @blackham7 7 років тому

    How dod you get 2/3? For the trapezium one?

  • @danielwatson5547
    @danielwatson5547 10 років тому

    For part b) I got a+b instead of your b-a answer, would it still be right?

  • @musicnotesrule1
    @musicnotesrule1 10 років тому

    I worked it out and calculated PN is 2NR. Would this still get me the mark? (at 22:55)

    • @RawMaths
      @RawMaths  10 років тому

      Yes if you can show one is a multiple of the other and they share a common point then they are on a straight line.

  • @asamsajid3951
    @asamsajid3951 9 років тому +2

    Could you explain how -s + 3/2s is 1/2s? Thanks :)

    • @RawMaths
      @RawMaths  9 років тому +6

      Asam Sajid -s is like -1s and 3/2s = 1.5s so -1 + 1.5 = 0.5 so 0.5s or 1/2s

    • @rishyadav15
      @rishyadav15 7 років тому +1

      or you could say -s = -2/2s and so -2/2 + 3/2s = -2+3/2s= 1/2s

  • @kareemhijazi4296
    @kareemhijazi4296 8 років тому

    For the third example didn't you work out YX not XY?

    • @RawMaths
      @RawMaths  8 років тому

      Nope I think I laid it out clearly as i went from x to w and w to z and z to y that is the same as xy

    • @kareemhijazi4296
      @kareemhijazi4296 8 років тому

      Yeah I got it now. Thx for the great vid

  • @katraathhhgjgfsdjjidejbdi371
    @katraathhhgjgfsdjjidejbdi371 7 років тому

    thank you sir.you are better than all teachers in my school combined.I don't think I will fail any question from this topic

    • @Alawneh
      @Alawneh 6 років тому

      i hope not

  • @ontheway5792
    @ontheway5792 9 років тому

    in 9:22 why we donot say that LK=3/4u+v+1/3(-u+v) !!!!

    • @AMKADID
      @AMKADID 5 років тому

      I have the same question
      did you get the ans after 3 years

  • @harveypenfold8998
    @harveypenfold8998 11 років тому

    on question 2 why is it not ⅓(2x + 4y) because 1+2 = 3

  • @effie2857
    @effie2857 8 років тому

    For the question at 6 minutes - how did you get 3/2?? :)

    • @AIlezAlIezAIIez
      @AIlezAlIezAIIez 8 років тому

      +Effie28 Because the question states the ZY : XY is in the ratio of 3:2 meaning ZY is 3 and XY is 2 - And to get from 2 to 3 you must multiple 2 by 1.5 or (3/2). WX is = to vector S and WX is 1.5 times shorter than ZY (As ZY is in the ratio of 3:2 to XY) so to get S to 3/2 you must multiple S by 3/2 to get '3/2S'

    • @effie2857
      @effie2857 8 років тому

      Thank you!! I was confused because usually with same line ratios you would do it 2/5 and 3/5 but thanks for explaining its just 3:2. Really helpful :) :)

    • @AIlezAlIezAIIez
      @AIlezAlIezAIIez 8 років тому

      +Effie28 Decent

    • @effie2857
      @effie2857 8 років тому

      nikhil saini what?

  • @basilyounas1063
    @basilyounas1063 6 років тому +1

    THANK YOU FOR MAKING THIS INFORMATIVE VIDEO SIR!!!
    it helped me alot..

  • @razzbag9237
    @razzbag9237 8 років тому

    Thank you!!! this had been doing my head in untill now :)

  • @anjalipatel1141
    @anjalipatel1141 10 років тому

    Wow.. thank you so much, I never understood vectors before this. Thank you thank you thank you

  • @himynameisjakeable
    @himynameisjakeable 9 років тому

    A very conductive 31minutes. Thank you very much

  • @amalindaaa
    @amalindaaa 3 роки тому

    thank you so much, this is very helpful

  • @jameslink2068
    @jameslink2068 5 років тому

    This is amazing and helpful! Thanks so much!

  • @ibrahimmansoor5286
    @ibrahimmansoor5286 6 років тому

    Sir you just made my day

  • @saghi1974
    @saghi1974 10 років тому +1

    Can't thank you enough. It was really helpful

    • @RawMaths
      @RawMaths  10 років тому

      I'm glad it was helpful good luck with exams.

  • @sasa-pw9so
    @sasa-pw9so 6 років тому

    thank you very much, i really appreciate your clear explanations and help :)

  • @unirpb2350
    @unirpb2350 9 років тому

    is this on the calculator paper?
    thanks for the video, i got almost all correct:D

    • @unirpb2350
      @unirpb2350 8 років тому

      Elite Droid thank you for answering but since posting I have found out it's on the second calc one - unit 3, thanks anyways:)

  • @HitanshuTheBoy
    @HitanshuTheBoy 9 років тому

    This video was perfect to show the proof of straight and parallel lines! Have exam in few hours! Good luck to me! :)

    • @dreamer_4937
      @dreamer_4937 9 років тому

      Hitanshu Arora How did u find it? shame vectors didn't reveal themselves

    • @HitanshuTheBoy
      @HitanshuTheBoy 9 років тому +1

      Edward Walters omg! The exam was extremely hard! The answers were too wordy for proofs and too long! Not a fair exam at all. I was extremely disappointed! I have been practicing past papers and getting 90 plus raw score. I don't think I will manage to get even 70 for this exam. How was yours?

    • @lukahnapeirogon8197
      @lukahnapeirogon8197 9 років тому +1

      Was the exam the one with hanna's sweets question with the proof of ?

    • @HitanshuTheBoy
      @HitanshuTheBoy 9 років тому

      icecubeinferno yes but that question was very easy. I skipped it because I looked at the question in the last 2 minutes and there was not enough time to write. The answers were too long! 1 hour 45 minutes was not enough for this hard exam

    • @dreamer_4937
      @dreamer_4937 9 років тому +1

      Hitanshu Arora It was going fine until i hit Hannah's fucking sweets! :D then stress kicked in... by using an unofficial markscheme online where somebody wrote all the answers i worked out i probably got 77/8%. And I, too, hv been getting 92% and that on my past papers, including timed ones (i have done about 25-30 papers). So need to beast this calculator on Monday to get A*! They'd better lower the boundaries, or as my friend put it 'Rains of Castamere' will be playing in their marking halls... -_-

  • @harshilmehta7445
    @harshilmehta7445 9 років тому

    Thanks a lot for your guidance. It was very helpful for me

  • @victoriapownall4871
    @victoriapownall4871 11 років тому

    Why is it 3/2 and not 3/5 ?? :/

  • @merhmehereteab32
    @merhmehereteab32 8 років тому +1

    thank you very much, you save ma day I appreciate it thanks

  • @yasirtaher0919
    @yasirtaher0919 5 років тому

    Thank you hope it helps for my exam

  • @shadreckngomane8224
    @shadreckngomane8224 5 років тому

    Thank you this is awesome

  • @rubybell1331
    @rubybell1331 6 років тому

    the index is very useful

  • @realest_
    @realest_ 10 років тому

    thank you so much!!!

  • @tarav8462
    @tarav8462 5 років тому

    THANK YOU !!!

  • @yahboyyah
    @yahboyyah 2 роки тому

    literally watching this now

  • @epictechdaniel9374
    @epictechdaniel9374 9 років тому +4

    If I Get A* Star I Will Be Amazed

  • @fazlayj
    @fazlayj 11 років тому +2

    Thank you

    • @RawMaths
      @RawMaths  11 років тому

      Hope it helped :)

    • @fazlayj
      @fazlayj 11 років тому

      RawMaths
      Yes it helped me a lot to get a quick revision on IGCSE Further P.Maths Vectors....Thanks again and keep up your good work :)

  • @raperyowieee1397
    @raperyowieee1397 7 років тому

    question 2 is incorrect

  • @cwapstra1397
    @cwapstra1397 5 років тому

    thank you :)

  • @maiaxxx8318
    @maiaxxx8318 6 років тому

    thank u so muchh:)

  • @yemanehaileab1623
    @yemanehaileab1623 8 років тому

    Useful

  • @Georginachester
    @Georginachester 2 роки тому

    I would’ve guessed 4!

  • @esmieadele8865
    @esmieadele8865 8 років тому +1

    you angel thank you

  • @lalisajade8204
    @lalisajade8204 7 років тому

    Having exam later thanks

    • @Alawneh
      @Alawneh 6 років тому

      good luck, if you're done, how did it go?

  • @ontheway5792
    @ontheway5792 9 років тому

    plz no facebook !!!! if I 'd like to ask some questions thnx in advance .

  • @duskfromak
    @duskfromak 9 років тому +1

    I can't simplify the fractions for the life of me

    • @dreamer_4937
      @dreamer_4937 9 років тому

      Lazar do you struggle with finding the common denominator?

  • @Zohaib10
    @Zohaib10 7 років тому

    30 minutes Long this ain’t East Enders you know

    • @RawMaths
      @RawMaths  7 років тому

      You do know you can stop and come back at any time?

    • @Zohaib10
      @Zohaib10 6 років тому

      RawMaths thanks for the tip. Really appreciate it. Helpful video.

  • @goek4587
    @goek4587 6 років тому

    Finger foot

    • @Alawneh
      @Alawneh 6 років тому

      leg bottom

  • @priya200328
    @priya200328 4 роки тому

    I can't do this ;C

  • @staceyuden3977
    @staceyuden3977 10 років тому

    Cool

  • @absG290
    @absG290 10 років тому +7

    You don't explain properly you just do the calculations without explains it because you've memorised the answers and it's so annoying!

    • @RawMaths
      @RawMaths  10 років тому +18

      I'm sorry you feel that way. It does say at the start that this is not a teaching video but a revision tool.

    • @poppyella2205
      @poppyella2205 7 років тому +6

      This video wasn't for teaching, he was just supplying us with practice questions essentially, then showing us the correct solutions once we'd paused and completed

    • @heartssmiles9032
      @heartssmiles9032 7 років тому +3

      His explanations are good and clear. If you are aiming A* or for 8+ then you are expected to know the stuff he is not explaining. Thats normal. A* and 8+ pupils are expected to think for themselves moreso. Brilliant video. Need more like em.

    • @Alawneh
      @Alawneh 6 років тому +1

      u just got pranked bro!

    • @haroonsiddiqui8901
      @haroonsiddiqui8901 6 років тому

      if u know the basics
      you'll understand

  • @reagangraham8332
    @reagangraham8332 10 років тому

    Thank you