This app explores subtracting proper fractions that may or may not start with common denominators using fraction circles.[br][list=1][*]Create your fractions you want to subtract. You will get a message if your fractions are not proper, if your common denominator is greater than 32, or if your difference would be negative. [/*][*]If you [i]need [/i]common denominators, click "Equivalent Fractions." Drag the slider until you find a common denominator that will create equivalent fractions.[/*][*]Drag the blue point on the right circle to the center of the left circle to see what subtracting will visually remove from the subtrahend.[/*][*]Click "Subtract Fractions" to actually subtract the two fraction circles.[/*][*]Write in your solution to see if you found the correct difference! [/*][/list]