ABBREV.
'(<a href="http://www.j-archive.com/media/2006-05-23_J_20.jpg" target="_blank">Kelly of the Clue Crew shows on the monitor that the fractions 1/3 = 4/12 and 1/4 = 3/12.</a>)  For 1/3 & 1/4, 12 is the LCD--lowest common denominator; for 2, 3, 4 & 6, 12 is the LCM, short for this'
least common multiple