This great tool helps you quickly build a hundred chart on your whiteboard, then build on easily to teach up to 120. And nope, we didn't forget the zero. Big quadrant pieces means no need for time-consuming assembly of many strips. Oversized, bold, colorful, and easy to see (assembled chart measures 24" W x 34" H.). Special t-shaped piece is an effective new tool in popular math programs that helps visualize 1 less and 1 more, and 10 less and 10 more. Dry-erase surface allows for easy circling and easy clean-up. Includes chart pieces, 0 piece, 20 highlighting frames, 20 cover-up squares, and unique t-shaped more/less piece. Ages 6+/Grades 1+.