Results 1 to 2 of 2

Math Help - prove consecutive multiples

  1. #1
    Member GAdams's Avatar
    Joined
    Apr 2007
    Posts
    171
    Awards
    1

    prove consecutive multiples

    Proove that the product of two consecutive multiples of 5 is always an even number

    I got:

    (5n) (5n + 5)

    25n^2 + 25n

    n(25n+25)

    -can't see it!
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Senior Member Twig's Avatar
    Joined
    Mar 2008
    From
    Gothenburg
    Posts
    396
    If n is odd then you have odd * (odd + odd) that is, odd* even = even

    If n is even, then even*(even + odd) = even * odd = even
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. [SOLVED] Prove: each square is the sum of 2 consecutive triangular numbers
    Posted in the Number Theory Forum
    Replies: 7
    Last Post: October 2nd 2010, 03:13 PM
  2. Multiples of 13
    Posted in the Number Theory Forum
    Replies: 9
    Last Post: May 5th 2009, 04:37 PM
  3. Consecutive Multiples
    Posted in the Algebra Forum
    Replies: 1
    Last Post: January 8th 2009, 09:09 AM
  4. Replies: 5
    Last Post: June 22nd 2008, 08:04 AM
  5. Multiples of 2, 3, 5, but not 7
    Posted in the Algebra Forum
    Replies: 2
    Last Post: April 11th 2005, 10:36 PM

Search Tags


/mathhelpforum @mathhelpforum