MATH-POURRI
'(<a href="http://www.j-archive.com/media/2010-03-04_DJ_11.jpg" target="_blank">Sarah of the clue crew stands in front of a board with numbers.</a>) The highest number that divides evenly into two different numbers is  called this, also known as GCF; for 40 and 100, the GCF is 20'
the greatest common factor