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. Includes a 20-question digital self-grading Easel Assessment. Did you know that you can use PowerPoints like this in video conferencing or Zoom for remote learning? You can share with your students in