Click on the links below for informations about adding and subtracting fractions with like denominators:
Adding Fractions with Like Denominators
Link #1-Teacher Tube (video-1:59)
Link #2-AAAMath (interactive lesson-scroll to bottom)
Link #3-Math.com (lesson)
Link #4-Math is Fun (lesson)
Link #5-Cool Math (lesson)
Link #6-Teacher Vision (printable)
Link #7-Math Splat (game)
Subtracting Fractions with Like Denominators
Link #2-AAA Math (interactive lesson-scroll to the bottom)
Link #3-Math .com (lesson)
Link #7-U of Chicago (interactive lesson)