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Math Help - Please help on 5th grade prime thingy

  1. #1
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    Please help on 5th grade prime thingy

    Hi, I really need help at umm prime factorization....uhh i think its like using exponents, so yeah... 36 , 81 , 65 , 19 , 24 , 18 , 40 , 75 , 27 , 32 , 49 , 25 , 42 , 104 , 55 , and 77
    PLEASE HELP IF YOU CAN
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  2. #2
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    Here's an example, I will keep reducing my factors until they are prime. Once this is done I put them into index form

     36 = 6\times 6 = (3\times 2)\times (3 \times 2) = 3^2\times 2^2

    Index form works as follows

    a\times a = a^2

    a\times a \times a = a^3

    a\times a \times a \times a= a^4

    and so on...
    Last edited by pickslides; September 10th 2009 at 03:13 PM. Reason: sp*
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  3. #3
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    Quote Originally Posted by pickslides View Post
    Here's an example, I will keep reducing my factors until they are prime. Once this is done I put them into index form

     36 = 6\times 6 = (3\times 2)\times (3 \times 2) = 3^2\times 2^2

    Index form works as follows

    a\times a = a^2

    a\times a \times a = a^3

    a\times a \times a \times a= a^4

    and so on...
    im really stupid....i dont really get what you mean...i just moved in USA 3 years....P.S. ME AZN (Asian)
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  4. #4
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    which bit could you follow? do you know the multiplication tables?
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  5. #5
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    Quote Originally Posted by pickslides View Post
    which bit could you follow? do you know the multiplication tables?
    yes....I know that...... i need help with prime factorization using exponents
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  6. #6
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    My first post in this thread is doing exactly what you are after, study it.

    Here is another example

    81 = 9\times 9 = (3\times 3) \times (3\times 3) = 3^4

    I made 81 into factors of 9, then the 9s into factors of 3.

    As I had (3\times 3) \times (3\times 3) I could say that was 3^4
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