math

posted by .

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

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Quick math question

    Can anyone give me a link to a free online algebra test for 9th graders. I have a test on Monday based on algebra to see if I can move on to Geometery and I need a test to see if I'm ready. Thanks
  2. Math

    Use the Factor Theorem to determine whether x-3 is a factor of P(x)=2x^3-5x^-9 . Specifically, evaluate P at the proper value, and then determine whether x-3 is a factor. P(_)=__ also pick which one applies x-3 is not a factor of P(x) …
  3. Algebra

    Use the Factor Theorem to determine whether x+2 is a factor of P(x)=2x^4+x^3-3x-9. Specifically, evaluate P at the proper value, and then determine whether x+2 is a factor. P(__)= x+2 is or is not a factor of P(x)____
  4. IB MATH STUDIES IA

    I am finding whether men or women are smarter. I am doing a chi-squared test to see if theres a correlation. What other sophisticated processes can i do?
  5. Statistics!!!

    b. The correlation between the number correct on a math test and the time it takes to complete the test is -.45. Test whether this correlation is significant for 80 children at the .05 level of significance. Choose either a one-or …
  6. VERY URGENT SCIENCE

    A science teacher was curious to see whether offering money for good grades would increase student performance on a test. The teacher offered half the students in the class $5.00 if they got an A on their next test. The other half …
  7. Science

    A science teacher was curious to see whether offering money for good grades would increase student performance on a test. The teacher offered half the students in the class $5.00 if they got an A on their next test. The other half …
  8. Science

    A science teacher was curious to see whether offering money for good grades would increase student peformance on a test. The teacher offered half of the students in the class $5.00 if they got an A on their next test. The other half …
  9. statistics

    A credit card company estimates that the average credit card balance of Americans is $3,210. A statistics student wants to know whether this is true for citizens of her home town. Which hypothesis test would be most appropriate for …
  10. Science

    A science teacher was curious to see whether offering money for good grades would increase student performance on a test. The teacher offered half of the students in the class $5.00 if they got an A on their next test. The other half …

More Similar Questions