Or -- if you are ok not to install Squeak images but OS images like virtual box 
-- you could also use LatexMorph.
http://www.tesujimath.org/squeak/LatexMorph 

Of course you would have to install Latex and Ghostscript first, and in the 
Squeak Image OSProcess, but then you could write all kinds of perfectly 
layouted formulas...

Then make a virtual box image to distribute it to the students.
As I said, it might very well be overkill for this problem.

Cheers

Markus


Am 10.05.2010 um 16:43 schrieb K. K. Subramaniam:

> On Monday 10 May 2010 12:01:58 am John Foster wrote:
>> My problem is how to display a fraction so it looks like a fraction, and
>> not like (2/5) + (7/8).  I want the vinculum to be a horizontal line:
>> 
>> 2     7      61
>> --- + --- =  ----
>> 5     8      40
> You could use a Column morph with its border width set to zero and fill style 
> set to transparent color. You may have to override cell positioning to bottom 
> right to get numbers to align right (halo for Column ->menu->layout->table 
> layout->cell positioning -> bottom right). Replace Red and Green morphs with 
> Text containing numerator and denominator. Set Yellow morph's color to black, 
> length to 3 and width to the max (numerator width, denominator width). 
> 
> Create Column morphs for first fraction, +, second fraction, =, total 
> fraction 
> and put them into a Row Morph.
> 
> HTH .. Subbu
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