This dry-erase classroom number line shows numbers -20 to 100. Large size makes it perfect for a classroom display and teachers can also write on it with a dry-erase marker. Clearly shows odd numbers in red and even numbers in blue. Measures 6.5" x 22" (16.5cm x 56cm) per piece and has 12 pieces to give a possible 22' (2.64m) wall number line. Includes teacher's guide. Grades 1 and up.