Major brain F*RT!! Please help!!!!

  1. It's a pretty sad day when you can't help your 6th grader in math!
    Heck, this actually started in 4th grade!

    Does anyone have ANY idea what the mystery number is?? Math is not one of my strong points! :imbar Actually, I'm doing well if I can add fractions!
    Here it is:


    Mystery Number!

    "I am a very popular number. In addition to being the least common multiple of 15, 18 and 20:

    I am 20 times larger than the square of 3;

    If you use a protractor to measure me as an angle, I form a semi-circle.

    Who am I?"

    :confused" Help???

    Thanks!
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  2. 13 Comments

  3. by   Rusty59
    I believe the answer is 180.


    180 can be divided by 15 - 12 times, by 18 - 10 times and by 20 - 9 times.

    The square of 3 is 9 and multiplied by 20 is 180.

    A semi-circle is 180 degrees.
    Last edit by Rusty59 on Aug 29, '02
  4. by   OHmom2boys
    I was thinking 90!!!!

    I'll take that 180!!

    Thanks again!
  5. by   Rustyhammer
    Yea.... Thats gonna come in useful someday.
    -Russell
  6. by   OHmom2boys
    Okay, just figured 3x3=9....9x20=180...right?

    Half circle is 180 degrees??

    I knew it would be something right in my face!!:imbar

    Thanks!

    Oops! We must have been posting at the same time! Thanks for getting my brain working...well, it's not really working, but I do like to pretend sometimes!
    Last edit by OHmom2boys on Aug 29, '02
  7. by   OHmom2boys
    oh yeah, I can see my son using that! NOT!

    Why are they starting this stuff in the 6th grade?? It's insane!

    I HATE homework! It's not like I don't have enough of my own! LOL!

    Thanks!
  8. by   sunnygirl272
    180
  9. by   prn nurse
    You said it Rusty!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!
  10. by   OHmom2boys
    Hey, I'm gonna blow 'em away in my algebra class I start next week, huh?

    Lord, I need help. What a total idiot!!
  11. by   Zee_RN
    Woot!!! For once I **KNEW** the math answer! Thanks! I needed that! As soon as you said, semi-circle I knew it! I am SOOO proud of myself. (I never get these things right either! Hubby has to do the math homework with the kids....)
  12. by   prn nurse
    Ohio mom.......You're not a total idiot !!!

    How many people would know how to do that problem?

    I studied algebra and geometry and took chemistry two semesters in college, and then even conquered statistics !

    But I didn't have a clue.....

    Math is like a second language. If you don't use it everyday, you forget it. I know the math I use daily, all the other
    stuff I knew once...... has vanished. If I study it for a few days, it comes back.........s....l...o...w...l...y...

    who needs it? as Rusty said........in the real world ??
  13. by   Mkue
    my youngest son is taking pre-algebra this year, i'm hoping that i can remember how to help him.. ugh !! let's see x+y =a+b:a+b=m+n:x+y=m+n, oh sure that makes sense.. lol

    i agree... it is a second language !
  14. by   GPatty
    180. The half a circle did it for me.

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