Greatest Common Factor PowerPoint (GCF) and Task Cards. Animated PowerPoint slides explain two methods of finding the Greatest Common Factor. Teacher directions, and two leveled sets of 10 task cards for practice in centers or as a wall walk with printable recording sheet and answer keys included. Created for middle school, but can be used in 5th grade for acceleration. Perfect for test prep in 6th grade, or use as a review in 7th and 8th grade. Includes a 20-question digital self-grading E