Rock N' Roll Math Teacher: How to tell if a Number is Divisible by 7

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Uploaded by on May 5, 2009

I saw this on the web a while back. It is one of a handful of methods I know of that shows you how to determine if a number is divisible by 7. Enjoy.

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Education

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  • 1,4,2,8,5,7,1,4,2,8,5,7,1,4,2,­8,5,7

    0*7=0=1-1

    1*7=7=10-3

    14*7=98=100-2

    142*7=994=1000-6

    1428*7=9996=10000-4

    14285*7=99995=100000-5

    142857*7=999999=1000000-1

    I think i understand how it works, but im not sure why its repetative.

  • Aw man, I wish I had seen this video earlier. I like how you go step by step.

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