SpinnerZ Dry-erase Learning Mat helps children learn addition and subtraction in a fun way with erasable dry-erase surfaces on both sides. One side offers four spinners with plastic hands for creating math problems. Students flick the spinner to two of the colorful number wedges and then write that number in a box for adding or subtracting in the spacious boxes below. The other side features preprinted math problems for practicing addition and subtraction. Sturdy dry-erase pages with reusable surface make it easy to write, erase and then practice again. Each set includes an 11" x 17", double-sided lapboard that works with dry-erase markers and most crayons. Lapboard includes one attached washable pen with a no cap-loss design.