These full-color, self-checking activity cards provide standards-based activities for use with the Hands-On Tally Marks™ plastic manipulatives, sold separately. The front side of the card presents the problem to solve with Hands-On Tally Marks™ manipulatives. Flip the card over and self-check the correct answer. Activity Cards are available at 3 levels, K-2, sold individually. Includes: 50 each 2.5” x 3.5” (playing card size) full-color, 2-sided, self-checking activity cards