Consumable. One set of these consumable sheets is included in Science K. You need one set per student.
If you might reuse your Instructor's Guide and Student Activity Sheets in the future (for a younger child, for instance), we strongly suggest that you purchase an extra set of Activity Sheets when you buy the Instructor's Guide. That way, when we update our Instructor's Guides you will have matching Activity Sheets when you need them. Please contact us if you are looking for Activity Sheets from the past. Of course, you may rather wait and take advantage of our Repurchase Discount when your younger students are ready for this level.