Math Is Fun Forum

  Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °

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#3176 Re: This is Cool » who woulda thunk it? » 2006-02-24 13:34:09

I haven't tried to understand your explanations, but it isn't remarkable to me.
#*#=2
#*#*#=3
#*#*#*#=4
#*#*#*#*#=5
#*#*#*#*#*#=6
The #'s go up slowly, but multiplying is so powerful, why wouldn't you expect to
approach one from above?  I would.

'Course I can't remember L'Hopital's Rule by its name.  I have a lot to review.
Don't explain for me, I'll do some research...

#3177 Re: Help Me ! » sequence » 2006-02-24 13:25:43

I tried playing the numbers as musical notes both major scale and chromatic scale, and I didn't recognize it.   Could be almost any type of substitution.
Eleven numbers, all used once.   Very interesting, but a mystery.

#3178 Re: Jokes » time's table short poems » 2006-02-24 12:09:24

Yeah, I just came online to say the same thing! 
I think the weetbix/crispix is the best one yet!! Thanks jU!!

#3179 Re: Jokes » time's table short poems » 2006-02-24 11:03:16

Awesome! There are 24 keys on the clarinet and the register key makes the tone go up 19 semitones (halfsteps) or an octave plus a fifth!  Vandoren Selects, my favorite reed.  Can't get them in the stores, I get the Selects online.

#3180 Re: Help Me ! » Need help for a triangle » 2006-02-24 04:42:23

Yes, I also get 48. 
But I did it maybe differently.
Make base of final triangle FG.
So area is 12H/2, where H is
2 + 6.
The 2 is half of the 4 distance given.
The 6 is 150% of the 4 distance given
because DC shrinks to AB and then
shinks to point E.  The perpendicular
heights reduce by same ratio as the
bases.  So (15-9):4 equals 9:6, so that
last 6 is the 150% bigger than the 4 in the
last ratio.  You need to draw it to see it.
So gnitsuk is correct!

#3181 Re: Jokes » time's table short poems » 2006-02-23 19:46:30

Nice one!! Like 8x9 straight line and lengthy too, 72.  It's a hit.

#3182 Re: Jokes » time's table short poems » 2006-02-23 19:09:58

Eight times eight, skate skate, slippery floor, sixty-four.

    Nine times nine, shine shine, hazy sun, eighty-one.

#3183 Re: Help Me ! » Please help me! ^_^ » 2006-02-23 18:44:33

I like to remember that a liter is a cube with all sides 10 cm.
And also 1 ml is a tiny cube with all sides 1 cm.
So a liter is 10 times 10 times 10 ml, where ml means milliliters or cc's
And so 1000 ml are in a liter.  Makes sense since milli means 1/1000.

#3184 Re: Help Me ! » Hi!! » 2006-02-23 18:38:53

Ramanita, if you tell us what you want to get better at, maybe we can help you.

#3185 Re: Jokes » time's table short poems » 2006-02-23 18:23:10

Coming up with alternates is a good idea since someone reading these might prefer one over another, so keep'm comin'...  The more the better.  A really catchy one could really be useful for someone.  My Dad is really good verbally, but not so with math, and he thinks this is a great idea.  Of course the ones I'm coming out with might not be that good, so feel free to do any over.

#3186 Re: Jokes » time's table short poems » 2006-02-23 17:40:27

We have a lot to go if we do everything from 2x2 to 9x9.

Five times five, jive jive, bend knee jive, twenty-five.

Seven times seven, Seventh Heaven, story time, forty-nine.
       (Seventh Heaven is a TV show in the states)

#3187 Re: Jokes » time's table short poems » 2006-02-23 15:47:00

Six times six, trig, trig, circly picts, thirty-six.
   
   Four times four, more chores, Fix seam, sixteen.

#3188 Re: Jokes » time's table short poems » 2006-02-23 11:50:57

I was thinking more of making a song out of them.  I could play the song
softly on my clarinet in the background, and then rerecord my voice singing
the math poems on top.  I use WavePad, a free recorder to make .wav files
at various sampling rates of your choice.  Then I'd give the cd to my nieces
to listen to.  It's all hypothetical.  First I've got to improve on my list of
times poems.  I actually finished a personal list, but most of them aren't
any good or don't make much sense, so I won't post them.

#3189 Re: Help Me ! » probability » 2006-02-23 11:31:15

So anyway, how I reason 14/81 for the 4 trees and 5 trees across the street, and the chance two are beside each other is:
probability of 1. plus probability of 2., where
1. On four trees side, beside each other is:  (2/4)(4/9)(3/9), but perhaps
I am wrong. and
2. On five trees side, beside each other is: (2/5)(5/9)(4/9)., but this may
be wrong, now that I think about it.
The 2/4 and the 2/5 multiplier is correct because if the two trees are on the
same side, then that is the probability they are beside each other.
The other two factors (4/9)(3/9) was my guess for the chance that the
two trees are on the 4 tree side of the street, but I bet I'm wrong with
that part. 
Sorry for any confusion saying I had the right answer.

#3190 Re: Help Me ! » probability » 2006-02-23 01:42:21

Also if 17 people are standing in a row and you are one of them.
Then the probability that you are beside a certain person is 2/17.
If 18 people are in a circle and you are one of them, then the
probability you are beside a certain person is still 2/17.
Pretty cool, huh?  I just discovered this yesterday.  The missing link.

#3191 Re: Help Me ! » probability » 2006-02-23 01:39:28

Okay, 14/81 is the answer to # 2.
The question being: If the trees in the above question are planted in random, find the probability that two particular trees are next to each other on the same side of the road.

#3192 Re: Jokes » time's table short poems » 2006-02-22 15:41:45

I think I am reverting into a child.  I spelt "their" as "there".  How careless.

#3193 Re: Jokes » time's table short poems » 2006-02-22 15:39:16

Three times four, bee door, small for elves, twelve.
Three times three, me, me, fine, nine.
Two times three, Who's tree? Sticks. Six.
Two times two, Who's who? I don't know anymore. Four.
  (The last one is good for my two twin nieces that I still can confuse sometimes.)

#3194 Re: Jokes » time's table short poems » 2006-02-22 15:36:15

Yeah.  That's why I'm doing this.  I figure some kid might actually like them.  Or even my nieces.  They will be learning there times tables in a few more years, and they are very good at remembering songs and singing, so they might like this idea.

#3195 Re: Jokes » time's table short poems » 2006-02-22 14:47:01

That made me laugh, mikau.
Here's another.
Three times six, free the fish, bait mean, eighteen.

#3196 Re: Jokes » time's table short poems » 2006-02-22 14:04:57

Five times six, Dive onto sticks, hurty, thirty.

#3197 Re: Jokes » time's table short poems » 2006-02-22 13:52:03

Five times nine, Drive mine, sporty-drive, forty-five.

#3198 Jokes » time's table short poems » 2006-02-22 12:37:22

John E. Franklin
Replies: 53

Four times eight, chores I'm late.
Dirty zoo, thirty-two!

Post ones you make up and I will.

#3199 Re: Help Me ! » formulae for writing a letter s using 8 mm radius » 2006-02-22 12:21:10

Make the vertical centers apart by a height difference of 7.
Make the horizontal centers apart by a width 2.
Put the top left of the bottom so it with look artistic.
In most programming x goes right and y goes down, so maybe choose
(4,4) for top and (6,11) for bottom.
If you want to make x go right and y go up like in graphing, then
make bottom center at (6,4) and
make the top center at (4,11).

#3200 Re: Help Me ! » Parcels and Packets » 2006-02-22 12:11:56

So for n = 2, we have dimensions 1,1,1 or 2,1,1 or 1,2,1 or 1,1,2.  Is that what you mean?

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