Students model subtraction facts with counters, and write the sum. Includes 4 workmats, see-through counters, 100 subtraction facts, and 4 crayons. This independent learning center helps children practice primary math skills, with little or no teacher assistance. The center uses a predictable, hands-on format, to reinforce classroom learning. There are enough materials for up to four children: workmats, manipulatives, step-by-step instructions, Teaching Notes, recording sheets, and storage pouch.