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math

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how would you test to see whether 7 is a factor of 291?

  • math -

    I would divide it out and see.

    or

    write down the number without the last digit
    29
    subtract twice the digit you skipped
    29
    -2
    ----
    27

    is 27 divisilbe by 7 ?
    no ? , then neither was 291

    for large numbers checking for divisibility by 7,
    repeat the above process until you can tell.

    Not very practical, but it works !!!

  • math -

    why 2 if the end digit is 1?

  • math -

    notice I said, "twice" the number skipped.
    2x1 = 2

  • math -

    i don't get it i want ms sue to help me!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

  • math -

    <g>

    Reiny is a REAL math teacher; I'm not.

    I'd just divide 291 by 7.

  • math -

    WOW I BELIEVED IN YOU:P

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