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Math Help - use only four 4's to make 10

  1. #1
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    use only four 4's to make 10

    hi its my second day at high school and they given me homework due in tomorrow morning plz help

    ive got to get four 4's into 10

    for example if i had to get four 4's into 8 i could do

    4 x 4 -4-4 = 8
    can use no other numbers but 4 and only 4 times

    for the number 7 i got 4 + 4 - (4/4) = 7




    plz help !!
    very grateful ty
    Last edited by darryl950; September 3rd 2008 at 01:45 PM.
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  2. #2
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    ((4+4)/4) + (4+4) = 2 + 8
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  3. #3
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    Quote Originally Posted by Maths_Tutoring View Post
    ((4+4)/4) + (4+4) = 2 + 8
    Thats five fours.
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  4. #4
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    thats 5
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  5. #5
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    i thot he said four 4s?

    im counting 5


    are you sure theres no other things we can use besides +- /*?
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  6. #6
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    u can use any simbols
    but only 4 4's
    no other numbers no less and no more than 4 4's
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  7. #7
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    4*4 -4 - sqrt(4)
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  8. #8
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    only onther way to do it i guess didnt really wanna use square root
    not sur eif teACHEr will accept, i got 4 + sqr 4 +sqr 4 +sqrt4


    thanks for d help guyz
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  9. #9
    Rhymes with Orange Chris L T521's Avatar
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    Quote Originally Posted by damadama View Post
    4*4 -4 - sqrt(4)
    If it was in exponential format, we'd have 4*4-4-(4)^{1/2}, which introduces a 2 that we don't want.

    If we were to just use symbols, your way is good. [Assuming that \sqrt{4}>0\implies \sqrt{4}=2~and~not~\pm2]

    --Chris
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  10. #10
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    aahhhh bustin mah chops


    i cant see any other way...
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  11. #11
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    eeepps, I thought this was just asking for fours not four fours! a little tricker than I first thought, will have to have a re-think
    yup, with out using sqrts it's a toughy, since it really only leaves you with a few options to play with


    4! = 24
    4toThe4 = 256
    4*4 = 16
    4+4 = 8
    Last edited by Maths_Tutoring; September 3rd 2008 at 02:49 PM.
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  12. #12
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    \frac{44-4}{4}
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  13. #13
    Moo
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    Quote Originally Posted by Chris L T521 View Post
    \sqrt{4}>0\implies \sqrt{4}=2~and~not~\pm2]

    --Chris
    \sqrt{4} EQUALS 2, there's no question about it !
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  14. #14
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    Quote Originally Posted by Moo View Post
    \sqrt{4} EQUALS 2, there's no question about it !
    What he meant that this doesn't fit the requirements of four 4's. There will be a \frac{1}{2}, should it be written as an exponent.
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  15. #15
    Kai
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    Quote Originally Posted by skeeter View Post
    \frac{44-4}{4}
    Ermm, can 44 really be counted as 2 fours ??, i mean theres no operation relating 44 and 2 fours, not really sure about it
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