Math Is Fun Forum
You are not logged in.
- Topics: Active | Unanswered
#1 2007-08-21 16:03:19
- MathsIsFun
- Administrator
- Registered: 2005-01-21
- Posts: 7,713
Common Denominator
Some animations about getting a Common Denominator
Thoughts?
"The physicists defer only to mathematicians, and the mathematicians defer only to God ..." - Leon M. Lederman
Offline
#2 2007-08-21 17:04:30
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,413
Re: Common Denominator
Excellent animation! Very well created!
It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.
Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.
Offline
#3 2007-08-22 06:34:13
- mikau
- Member
- Registered: 2005-08-22
- Posts: 1,504
Re: Common Denominator
hmm... to be honest I find it a little confusing.
In my oppinion it would clearer, if you did it this way
1/3 + 1/5, the first step is to write the cross product as the numerator of the sum
(1*5 + 3*1) then draw a line beneath it, and write the denominator of the sum as the product of the two denominators. (1*5+3*1)/(3*5) = 8/15
I just think its more straightforward. Does anyone agree?
Last edited by mikau (2007-08-22 06:35:37)
A logarithm is just a misspelled algorithm.
Offline
#4 2007-08-22 11:49:38
- mikau
- Member
- Registered: 2005-08-22
- Posts: 1,504
Re: Common Denominator
but i probably only prefer that because thats how I add fractions. 
A logarithm is just a misspelled algorithm.
Offline
#5 2007-08-22 15:04:46
- John E. Franklin
- Member
- Registered: 2005-08-29
- Posts: 3,588
Re: Common Denominator
mikau, that's cool but mif's thing is the standard way I learned, so it looks easy to me.
To critique it well, you have to pretend you don't know how to do it, and watch it.
I'll watch again and pretend...
After watching a few times, the only minor thing is that you might want to
erase the green highlight before drawing the lavender highlight to the right,
so you can see it better. If it is possible.
Last edited by John E. Franklin (2007-08-22 15:09:57)
igloo myrtilles fourmis
Offline
#6 2007-08-23 10:13:36
- MathsIsFun
- Administrator
- Registered: 2005-01-21
- Posts: 7,713
Re: Common Denominator
(1*5 + 3*1) then draw a line beneath it, and write the denominator of the sum as the product of the two denominators. (1*5+3*1)/(3*5) = 8/15
That is actually quicker, but I am building on the concept of Equivalent Fractions (http://www.mathsisfun.com/equivalent_fractions.html) so want to keep it along those lines.
Maybe I could have an animation "quick method" ... ?
"The physicists defer only to mathematicians, and the mathematicians defer only to God ..." - Leon M. Lederman
Offline