Group Challenge: Q15 (by Domo-Kun)


Question 15:
(a) Find the prime factorisation of the following numbers and write your answers in index notation.
(i) 27
(ii) 99
(iii) 135

(b) Hence, find
(i) the HCF of 27, 99 and 135 in prime factorisation form
(ii) the LCM of 27, 99 and 135 in prime factorisation form

10 comments:

  1. For (b) (i), why use 9 as a factor to divide the numbers? What's a better way to do it?

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  2. I did not Understand anything

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  3. why is it when finding the HCF you guys divided the numbers by 9?9 is not a prime number you know???

    BTWFYI, I am Lovy

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  4. As per usual, NO EYE CONTACT. And Toby and Gladys seemed to be in a rush and tried to cut down on words and spoke too fast. Their voices were too soft, but the working on the paper was clearer than the previous group.

    -Mark Tay

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  5. I know one of the LCM is 9 but u shouldn't divide it by 9 first. Instead u should divide it by 3 first?

    FYIBTW, And for your good, I am Owen.

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  6. Ryan is talking not loud enough.
    Ryan don't have eye contact.
    The wordings are too small BUT THEY HAVE SPACE TO DRAW DOMO!!!!!!!

    MACSPICY:)

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  7. This comment has been removed by the author.

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  8. Thank you for your comments and noted √

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  9. How did u find the common multiple?

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