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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

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

ReplyDelete24x24x24 is NOT equal to 24.

comment: is it just because of the 'x' sign?

DeleteGrade C

There is not multiply sign in between (2^3x3) and (2^3x3)

Delete@4x24x24 is NOT equal to 24. instead it is 24^3

24*

Deletecomment; the revised solution is much better.

DeleteGrade A

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"

ReplyDeletecomment: you got the idea but check the heading again.

DeleteGrade B

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

DeleteThe revised answer is much better. Grade A

DeleteLine 4 is incorrect. 24x24x24 does not equal to 24.

ReplyDeleteIt should be written 24^3 in line 4.

comment: you got the idea but check the heading again.

DeleteGrade B

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

ReplyDeletecomment: you got the idea but check the heading again. elaborate please

DeleteGrade B

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.

ReplyDeleteComment: very good observation.

DeleteGrade A

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.

ReplyDeleteComment: very good observation. Its about presentation

DeleteGrade A

Line 4 is incorrect, because 24x24x24 is not equal to 24, the student should have written 24^3

ReplyDeleteThe next step is to go on to state that the cube root of 13824 is 24

Comment: very good observation. The student should improve on presentation

DeleteGrade A

Line 1 is incorrect. By multiplying 3824 by 2, it is an redundant step.

ReplyDeleteLine 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.

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

ReplyDeleteComment: very good observation but how should the student present the answer?

DeleteGrade B

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

ReplyDeleteComment: very good observation but how should the student present the answer?

DeleteGrade B

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 )

ReplyDeleteLine 4 is wrong as 24x24x24 is not equal to 24, it equals to 13824.

ReplyDeleteComment: very good observation but how should the student present the answer to cube root 13824?

DeleteGrade B

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

ReplyDeleteComment: very good observation but how should the student present the answer to cube root 13824?

DeleteGrade B

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.

ReplyDeleteComment: very good observation but how should the student present the answer to cube root 13824?

DeleteGrade B

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

ReplyDeleteGrade B

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

ReplyDeleteLine 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

ReplyDeleteGrade B

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

ReplyDeleteGrade B

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

ReplyDeleteGrade B

it should be 2*3

ReplyDeleteGrade B

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

ReplyDeleteComment: very good observation

DeleteGrade A

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

ReplyDeleteGrade B

line 4 is wrong as 24x24x24 is not 24

ReplyDeleteGrade B

line 4 is wrong because 24x24x24 is not 24

ReplyDeleteGrade B