Friday, January 20, 2017

NUMBER SYSTEM (CUBE ROOT)

Highest Common Factor - Cube Root

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Objective:Question: Find the cube root of 13824

Read the working carefully.
  • Highlight area(s) that you think is incomplete
  • Identify an 'critical' mistake - because of the way the working is presented



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post your responses as a 'comment'


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FOLLOW-UP ACTIVITY

Prime Numbers & Sieve of Erastosthenes

50 comments:

  1. There is no multiply sign in between (2^3x3) and (2^3x3)

    24x24x24 is NOT equal to 24.

    ReplyDelete
    Replies
    1. comment: is it just because of the 'x' sign?
      Grade C

      Delete
    2. There is not multiply sign in between (2^3x3) and (2^3x3)
      @4x24x24 is NOT equal to 24. instead it is 24^3

      Delete
    3. comment; the revised solution is much better.
      Grade A

      Delete
  2. Line 4 is incorrect as 24x24x24 does not equal to 24 and instead equals to 24^3 which should be in line 4 instead of solely "24"

    ReplyDelete
    Replies
    1. comment: you got the idea but check the heading again.
      Grade B

      Delete
    2. The Correct working presentation should be : √13824 = √2^9*3^3 = (2^3)(3) = 8*3 . By prime factorisation, the cube root of 13824 is 24

      Delete
    3. The revised answer is much better. Grade A

      Delete
  3. Line 4 is incorrect. 24x24x24 does not equal to 24.
    It should be written 24^3 in line 4.

    ReplyDelete
    Replies
    1. comment: you got the idea but check the heading again.
      Grade B

      Delete
  4. Line 4 is incorrect, because 24x24x24 is not equal to 24, the cube root of 13824.

    ReplyDelete
    Replies
    1. comment: you got the idea but check the heading again. elaborate please
      Grade B

      Delete
  5. Line 4 is incorrect, because 24x24x24 is not equal to 24. It is the cube root of 13824. There should be an indication to show that 13824 cube root is equals to 24.

    ReplyDelete
  6. Line 4 is incorrect as 24x24x24 does not equal to 24. Instead it equals to 13824. 24 is the cube root of 13824. He should have wrote somewhere to saw that the cube root of 13824 is 24.

    ReplyDelete
    Replies
    1. Comment: very good observation. Its about presentation
      Grade A

      Delete
  7. Line 4 is incorrect, because 24x24x24 is not equal to 24, the student should have written 24^3
    The next step is to go on to state that the cube root of 13824 is 24

    ReplyDelete
    Replies
    1. Comment: very good observation. The student should improve on presentation
      Grade A

      Delete
  8. Line 1 is incorrect. By multiplying 3824 by 2, it is an redundant step.
    Line 4 is incorrect too. 24x24x24 does NOT have the same meaning as 24. This student needs to know that 24x24x24 is 24 to the power of 3.

    ReplyDelete
  9. Line 4 is incorrect.Multiplying 24 by 24 by 24 should result into 24 to the power of 3.

    ReplyDelete
    Replies
    1. Comment: very good observation but how should the student present the answer?
      Grade B

      Delete
  10. line 4 is wrong.24x24x24 does not mean the same as 24. It is actually 24 to the power of 3 instead.

    ReplyDelete
    Replies
    1. Comment: very good observation but how should the student present the answer?
      Grade B

      Delete
  11. line 4 is wrong as 24x24x24 is not the same thing as 24 as if u do 24x24x24 the answer is 13824. NOT 24. The correct step is 24 to the power of 3 E.g. ( 3^3 )

    ReplyDelete
  12. Line 4 is wrong as 24x24x24 is not equal to 24, it equals to 13824.

    ReplyDelete
    Replies
    1. Comment: very good observation but how should the student present the answer to cube root 13824?
      Grade B

      Delete
  13. line 4 is incorrect. 24x24x24 should be 24 to the power of 3.

    ReplyDelete
    Replies
    1. Comment: very good observation but how should the student present the answer to cube root 13824?
      Grade B

      Delete
  14. 24x24x24 is not 24, a step is missing.24x24x24 is 24 to the power of three , then cube root 24 to the power of three to have the answer 24.

    ReplyDelete
    Replies
    1. Comment: very good observation but how should the student present the answer to cube root 13824?
      Grade B

      Delete
  15. Line 4 is wrong as 24x24x24 is not equal to 24 but is instead equal to 13824.

    ReplyDelete
    Replies
    1. Comment: very good observation but how should the student present the answer to cube root 13824?
      Grade B

      Delete
  16. Line 3 and 4 does not tally as 24x24x24 does not give me 24, it gives me 13824, not 24.

    ReplyDelete
  17. Line 4 is incorrect as 24x24x24 is not 24 and you the last statement is also incorrect as the square root of 13824 is not 24

    ReplyDelete
    Replies
    1. Comment: very good observation but how should the student present the answer to cube root 13824?
      Grade B

      Delete
  18. line 4 is clearly wrong as 24/3 means 24x24x24 which will give you 13824.not 24

    ReplyDelete
    Replies
    1. Comment: very good observation but how should the student present the answer to cube root 13824?
      Grade B

      Delete
  19. 24 x24x 24 is not equal to 24. instead it is equal to 13824

    ReplyDelete
    Replies
    1. Comment: very good observation but how should the student present the answer to cube root 13824?
      Grade B

      Delete
  20. Replies
    1. Comment: very good observation but how should the student present the answer to cube root 13824?
      Grade B

      Delete
  21. line 3 is a number statement which reads as 24x24x24 the correct answer line 4 should have been 13824 however the answer stated is 24. another mistake is the 24x24x24 to simplify it you can put it in index notation

    ReplyDelete
  22. LIne 4 is wrong as the product of 24x24x24 is not 24 an, so the answer is 13824.

    ReplyDelete
    Replies
    1. Comment: very good observation but how should the student present the answer to cube root 13824?
      Grade B

      Delete
  23. line 4 is wrong as 24x24x24 is not 24

    ReplyDelete
    Replies
    1. Comment: very good observation but how should the student present the answer to cube root 13824?
      Grade B

      Delete
  24. line 4 is wrong because 24x24x24 is not 24

    ReplyDelete
    Replies
    1. Comment: very good observation but how should the student present the answer to cube root 13824?
      Grade B

      Delete

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