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Sorrow Free
Lv 5
Sorrow Free asked in Education & ReferenceTrivia · 1 decade ago

Add numbers 1 to 1000 consecutively.?

1+2+3+4....999+1000

7 Answers

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  • Gregory G
    1 decade ago
    Favorite Answer

    The sum of the first n counting numbers is n(n+1)/2.

    So in this case, the answer will be 1000*1001/2=500500

    Source(s): Any good algebra textbook should have this formula as well as a derivation.
  • Jim M
    Lv 6
    1 decade ago

    (1000+1) + (999 + 2) + ... + (501 + 500)

    = 1001 * 500

    = 500500

  • deonamihouse
    1 decade ago

    I think Gregory G got it but i may have to look at the implied meaning of the sum.

    Source(s): secrets hidden in numbers
  • Anonymous
    1 decade ago

    Let me find my calculator!

    Hey? Ms. Free? can you do that without a calculator?

    Edit - Whoa! Good answers down below!

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  • Anonymous
    5 years ago

    7x11x13 =1001, which when you multiply by abc shifts over the abc to the 100thousand, 10 thousand and thousand positions, giving you abc,abc

  • Anonymous
    7 years ago

    500500

  • regizzy
    Lv 5
    1 decade ago

    500,500

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