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Question for our teachers and math whizzes

(23 posts)
  • Started 3 years ago by Crazycatman - CA
  • Latest reply from Momma to 2 MaineCoons

  1. My son is working on a project for Pre-Algebra, one of the problems he has to solve is driving us all crazy.

    A seven digit number can be determined from the following clues:
    The first 3 digits appear in descending order with a sum of 15 and a product of 120.
    The final four digits consist of three prime numbers in ascending order surrounding a composite number in the second-to-last position. These four digits have a product of 560. Find the number.

    Ok, the first 3 digits we have figured out...654
    6+5+4 = 15 and 6X5X4 = 120 Cool

    Problem is the final 4...we can't seem to make it work.

    Help??????

    Posted 3 years ago by Crazycatman - CA #

  2. CCM, I'll I can do is to help keep this bumped!!! Yikes!

    Posted 3 years ago by 2bpurring #

  3. my brain exploded
    LOL?

    Posted 3 years ago by Buttercup #

  4. Yeah..it's been a real stumper...

    Sorry Buttercup, did not intend to explode anyones brain..:)

    Posted 3 years ago by Crazycatman - CA #

  5. 6542587
    2,5,7 - prime numbers in ascending order
    8 composite number
    2*5*8*7 = 560

    Posted 3 years ago by jessiebelle13 #

  6. Wow.. I'm impressed. I had no idea what a composite number was !

    Posted 3 years ago by 2 Popoki #

  7. I just figured it out, too. If I wouldn't have had to teach my math classes, I could've done this a little earlier---darn classes! :)

    Posted 3 years ago by FondaHonda #

  8. Whoo Hoo to JB13...very impressive!

    Posted 3 years ago by 2bpurring #

  9. Thank you very much JB13!!!!! You are great!!!!!!!!!

    I thought my brain was going to explode.

    Posted 3 years ago by Crazycatman - CA #

  10. I went to college for secondary education in math, but decided to pursue a career in the financial industry after graduation. Glad to know that my skills are still intact!

    Posted 3 years ago by jessiebelle13 #

  11. JB13, is there a formula you used to calculate the answer?

    Posted 3 years ago by Leeny #

  12. No, just trial and error. I don't believe that there would be a formula for this type of question.

    Posted 3 years ago by jessiebelle13 #

  13. You must be good a suduko!

    Posted 3 years ago by AV #

  14. BTW, what is a composite number?

    Posted 3 years ago by Leeny #

  15. I do love suduko! Leeny, numbers are either prime (divisible only by 1 and itself) or composite (divisible by at least one other number).

    Posted 3 years ago by jessiebelle13 #

  16. I am a Sudoku ADDICT!!! Not only did I pay for Websudoku (because I prefer the puzzles to be larger when played online), I have a handheld computer one and probably 10 books of puzzles--one of which I carry in my purse at all times. Sure makes an oil change go by faster! I won't even mention the huge pencil sharpener that sits atop my bar at home because I only like really sharp pencils. . .

    *muttering because I only got to do 1 puzzle at lunch*

    Posted 3 years ago by FondaHonda #

  17. Seriously impressed! :o)

    I scraped through my maths exam at age 16, it wasn't compulsory after that, and I swore I'd never touch maths again!!! Of course I use it every day, but I still cannot fathom out long division. My calculator is my friend!

    Posted 3 years ago by MadcatwomanintheUK #

  18. wow...I am really impressed..I got confused and lost reading Chuck's problem, let alone trying to figure it out.

    Posted 3 years ago by cricketsmama #

  19. "three prime numbers in ascending order surrounding a composite number in the second-to-last position" this confused us, we were looking for 3 primes and a composite that were all in ascending order..but after going back and reading it again I feel dumb :(

    Posted 3 years ago by Crazycatman - CA #

  20. Okay...now my brain exploded! Thank goodness it didn't make a big mess. lol

    Posted 3 years ago by feral #

  21. Susie, I'm still trying to understand the question...!

    Posted 3 years ago by MadcatwomanintheUK #

  22. OK!!! No more brain explosions please!! It is becoming very messy in here. :)

    Posted 3 years ago by Crazycatman - CA #

  23. Hahhahaahha CCM! I am so glad you got your answer! I was working it out when I came up with the answer and scrolled down to answer when I saw you already had it hehehe!

    Posted 3 years ago by Momma to 2 MaineCoons #


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