### Group Challenge: Q14 (by Ze Specs)

Question 14﻿:
(a) Find the prime factorisation of 3375 and write your answer in index notation.

(b) Hence, deduce and write down
(i) the smallest 2-digit number that is a factor of 3375
(ii) the largest 2 digit number that is a factor of 3375
(iii) the smallest 3-digit number that is a factor of 3375
(iv) the smallest 4-digit number that is a factor of 3375

1. For Prime factorisation of 3375, why choose 3 to start with? How did you choose those numbers?

2. Ishani keep kick her leg
WS put his hands into the pocket
NO eye contact
Talking to wall

3. The ladder to find the prime ladder... why use one no at a time instead of both together?

4. Mark Tay Hao Yang1/25/2011 11:51:00 AM

wei siew put his hands into his pocket at the start, and Ishani was swinging for the whole time that she was speaking, and they did not explain the question before plunging into saying all the working which is as good as just letting us look at the paper.

5. I don't really understand what they are talking about

6. Quite soft.Only reading from the paper and not giving proper explanations.Many stammering.Don't understand what is the questions what more the answers.

FYI, im Lovy

7. They are not explaining, simply reading off the paper....

8. wrong wrong.. take out my 1st comment
Why must you use 5 for the third "bar" of the ladder instead of 3?

9. They are speaking a bit too fast ,soft , and monotonous.
No eye contact.
Ishani keep kicking her leg.
WS's body language is poor .
Not systematic.
We can't see the paper .
The solution is abit messy.
We can hear them but don't really understand their solution.

MacSpicy :D

10. Mark Tay Hao Yang1/25/2011 11:54:00 AM

I mean swinging her leg

11. For the Prime Factorisation of 3375 when you say put the number in index notation, why did you start with 3 and not 5? Also how did you use those answers to deduce down to the smallest 2-digit number factor, largest 2- digit number, smallest 3 digit factor etc.

12. They were talking too softly and they were facing the wall, so I could not hear or understand what they were saying and their explanations.

13. the explanantion is not so clear.

14. @ms loh, we chose 3 because we should always start with smallest prime number ,2,is the smallest but 3375 is not divisible by so we chose 3 as it was the next smallest number that is able to divide 3375.-ze specs

15. How did you find the smallest 2-digit number that is a factor of 3375?,
the largest 2 digit number that is a factor of 3375?
the smallest 3-digit number that is a factor of 3375?
the smallest 4-digit number that is a factor of 3375?

Can you explain again?

16. BTW, Nemo is owen.

17. They did not state what they are finding on the paper. The presenting of the questions is kind of confusing .

18. The second explanation is clear .

MacSpicy :D

19. @Mark, Yide, Lovy, toby,Ryan.
Sorry,Why didn't u ask us when ishani asked the audience for questions? We could have explained.

20. I put my hands in my pockets because cold and I do not know what they writing so just read.

21. This comment has been removed by the author.

22. Now i can understand much better