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Thread: Fifth Grade Division

  1. #1
    Super Member harpazo's Avatar
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    Fifth Grade Division

    My nephew was given the following homework:

    What is 500 66?

    The calculator tells me that 7.5757575758 is the answer. The teacher wants the class to work it put by hand.
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    Forum Admin topsquark's Avatar
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    Re: Fifth Grade Division

    Quote Originally Posted by harpazo View Post
    My nephew was given the following homework:

    What is 500 66?

    The calculator tells me that 7.5757575758 is the answer. The teacher wants the class to work it put by hand.
    Here is a decent video.

    -Dan
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  3. #3
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    Re: Fifth Grade Division

    66 is pretty close to 70 so I would try 7 as a "trial divisor": 7 divides into 50 7 times. 7*66 is 7*66= 462. 500- 462= 38 so we have, so far, 7 as quotient and remainder 38. Bringing down a "0" gives 380. 7 divides into 38 5 times. 5*66= 330. 380- 330= 50. So far we have 7.5 with remainder 50. Bringing down a "0" makes that 500, the number we started with. Continuing will just repeat the "75" again. 500/66= 5.757575757... with the "57" repeating. (Which is NOT "7.5757575758".)
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    Super Member harpazo's Avatar
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    Re: Fifth Grade Division

    Quote Originally Posted by HallsofIvy View Post
    66 is pretty close to 70 so I would try 7 as a "trial divisor": 7 divides into 50 7 times. 7*66 is 7*66= 462. 500- 462= 38 so we have, so far, 7 as quotient and remainder 38. Bringing down a "0" gives 380. 7 divides into 38 5 times. 5*66= 330. 380- 330= 50. So far we have 7.5 with remainder 50. Bringing down a "0" makes that 500, the number we started with. Continuing will just repeat the "75" again. 500/66= 5.757575757... with the "57" repeating. (Which is NOT "7.5757575758".)
    We can say that 500/66 = 7.57 with a bar above the numbers 57 to show repetition. Correct?
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  5. #5
    Super Member harpazo's Avatar
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    Re: Fifth Grade Division

    Quote Originally Posted by topsquark View Post
    Here is a decent video.

    -Dan
    I decided to reduce 500/66 to 250/33 and got the same answer: 7.57 with a bar above 57 to show repetition.
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    Re: Fifth Grade Division

    Quote Originally Posted by harpazo View Post
    We can say that 500/66 = 7.57 with a bar above the numbers 57 to show repetition. Correct?
    Yes, that is correct.
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    Super Member harpazo's Avatar
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    Re: Fifth Grade Division

    Quote Originally Posted by HallsofIvy View Post
    Yes, that is correct.
    Very good. I still recall my elementary school math.
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  8. #8
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    Re: Fifth Grade Division

    It's not easy is it?
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  9. #9
    Super Member harpazo's Avatar
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    Re: Fifth Grade Division

    I rarely play with grades 1 through 5 math.
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