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Conferences  The CTK Exchange Middle school |
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Discussion Topic |
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Last Updated Date/Author |
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Circular Diameters Within A Circumscribed Circular Area
Hello.
This may be a simple question, but it's one which I must grapple with at the moment.
I need to know how to figure the circular pe... |
AQuestion  |
Dec-18-10 04:30 PM
by AQuestion |
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sequences
what is the next 10 numbers in each sequences.
1,2,2,4,2
3,1,4,1,5
this should be easy... |
The Teacher |
Nov-21-10 06:45 AM
by alexb |
7
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Clarification on proof #82 of pythagorean theorem please
I understand that based on the similarity between Triangle ABC and DBE that the AA similarity dictates that x/(a-x)=b/c, but i do not unde... |
WVIlIWVV |
Mar-08-10 00:21 AM
by alexb |
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Proof #25 of the Pythagorean Theorem
I don't really get why a☐LMOA=a☐LKCA=a☐ACDE and a☐HMOB=a☐HKCB=a☐HKDF... |
Catherine |
Mar-06-10 05:17 PM
by alexb |
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question about 8 balls, 3 weighings
There are many websites which detail the 12 balls, 3 weighings problem. (one ball of a different weight to the other 11, but not known whether ... |
Edward |
Oct-12-09 03:27 PM
by alexb |
3
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Are these sets equal?
Dear Sir,
I've got a question on Sets.. I'll be very appreciate if you help me..
Let
A = {3!, 2^3, 12/15} and B %... |
Ahmet |
Jul-10-09 11:20 AM
by alexb |
1
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geometric proof
Dear Alexander Bogomolny,
I love your 'cut the knot website', which is indeed both accurate, serious, and authoritative in your mathe... |
Lawrence |
Jun-01-09 11:07 PM
by alexb |
4
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parentheses/PEMDAS game
I am looking for a game that I came across some time ago. I believe it was Java-based, and I thought it was on cut-the-knot, but I can't find i... |
Paul |
Mar-16-09 11:08 PM
by alexb |
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Problem solving Magic triangles
You have 2 triangles that overlap each other looks like a star when overlapped. The question ask to Place the numbers 1-12 at the dots so that the sum... |
GAry |
Mar-05-09 06:34 PM
by Kayla |
3
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Help me find Hisashi ABE, Pythagorean Theorem
I am supposed to find out about Hisashi ABE. He found a solution to the Pythagorean theorem-relatively recently 1980?. I tried Google and Yahoo!%2... |
likesmath |
Oct-06-08 11:11 AM
by Sid |
2
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Numbers raised to the power of 0
Please can anyone explain to me why, when any real number is raised to the power of zero, the result is 1.... |
Chris Tolley |
Aug-25-08 12:17 PM
by megamath |
20
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long division
Can anyone help me??
I need a number which divides by 2,3,4,5,6 and always leaves remainder 1 but divides by 7 and leaves no remainde... |
Susan |
Aug-25-08 12:17 PM
by megamath |
4
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Monty Hall Problem
[View All]
I recently read the book _The Man Who Loved Only Numbers_ by Paul Hoffman (the story of the prolific mathematician Paul Erdős). In his book, H... |
linkdon |
Aug-05-08 12:48 PM
by 52-Card Monty |
75
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Constucting a triangle instructions
Dear Alex,
I’ve been enjoying your math-focused website. I ran across this explanation for triangle construction given an angle “A”, ... |
Gerald B. |
May-20-08 01:32 PM
by alexb |
3
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Divisibility rules - Jargon buster needed
http://www.cut-the-knot.org/blue/div7-11-13.shtml
I can follow the explanation from the example but would still like to know what these... |
Carolyn |
Apr-04-08 08:35 AM
by Carolyn |
2
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Fifth Power Of Digits
Dear All My Friends,
Why fifth power of any digit is ended with this same digit also?
Here is my calculations:
0^5 = 0
1^5 = 1%0... |
Bui Quang Tuan |
Feb-23-08 04:46 PM
by alexb |
3
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math
i think that the square root of 100 is 50... |
jasmine |
Jan-30-08 12:06 PM
by laloka |
3
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math problem no answer in sight
[View All]
I beleive this is a problem from Benjamin Banneker
you must spend $100 and buy 100 animals
Cows $5.oo each
Goats $1.00 each
Chickens .0... |
Dmom |
Jan-13-08 08:24 AM
by Martin |
24
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Fabulous Fours
We are doing this thing at school where we have to make every number from 1 - 100 using only four 4's and exactly four 4's to make each number. F... |
brooke61790 |
May-28-07 11:27 PM
by alexb |
5
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math puzzle
[View All]
Can anyone figure this out?
A column of soldiers is 25 miles long and they march 25 miles a day One morning a messenger started at the rear of... |
syko |
May-25-07 09:51 AM
by Jacob B |
43
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golf problem
I am about to go on a golf tour with 24 players - we are playing 4 rounds on 4 days - each player plays in a group of 4 people - there are 6 groups of... |
Tony Wall |
Apr-26-07 03:09 PM
by Tony Wall |
0
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Hexa Trex... New Math Puzzle
I just wanted to let you know of a new math puzzle I created. It's called Hexa Trex . The object of the puzzle is to find a path through ALL the ... |
Bogusia |
Apr-17-07 12:15 PM
by Bogusia |
0
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what is this puzzle called?
is there a name for this kind of puzzle:
a birthdate is 04/26/66 how many ways do they connect?
4= 2-6 etc.
is this a puzzle te... |
jenny |
Apr-12-07 11:49 AM
by alexb |
1
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Math Puzzle ..Seems impossible
Ok u have 2 squares on top and 3 on bottom yet the 3 on bottom goes as one being underneath the top left square and the other 2 out to left beside it%... |
TMartin |
Feb-21-07 08:08 AM
by TMartin |
0
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raising 4 to the n-th power
Hello. My friend asked me to slove a math problem, but i can't slove it too:
Find all values of 'n' in this equation: 4^n + 4^%... |
coolman |
Nov-20-06 07:31 AM
by NAL |
3
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Word problems
Help me do these word problems.
1.For every 150 seed you sow,97 germinate. At this rate, how many seeds will germinate if you sow 2550 seeds?%... |
Raelynn |
Oct-28-06 06:27 AM
by suporabhath |
2
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Math Layout
I am having some trouble figuring out a way to make a layout of a cube I have to draw different ways to amke a cube and do not understand?... |
AEROX |
Oct-23-06 10:08 PM
by Silver_dragon |
5
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Parallel Lines
Hi,
Could you please clarify my doubt that in a 2-D plane, where do parallel lines meet? Do they meet at + infinity or - infinty or both... |
abhineetkaul |
Sep-30-06 07:07 AM
by alexb |
3
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a walking man and a running dog
A man is taking his dog for a walk. They set off together for a waterfall 10 miles away. They set off exactly together and the man walks at a steady... |
Jules4Rog |
May-21-06 11:29 PM
by iliaden |
8
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How to solve a Parabola graphically
I don't understand how to solve parabola question grapahically. Can you please help me?... |
Jasmine |
May-08-06 01:27 PM
by stapel |
3
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