The easy challenge in this applet asks the user to decompose a fraction [br]into the sum or difference of two fractions that have the same denominator.[br][br]A harder challenge is to decompose a fraction into the sum or difference of[br]two fractions with different denominators.[br][br]Harder still is the challenge to decompose a fraction into two fractions[br]neither of whose denominators is the same as that of the original fraction.[br][br][color=#ff0000][i][b]What questions could/would you put to your students based on this applet?[/b][/i][/color]