The large format of this wall number line is designed to encourage whole class participation. It consists of two sections each measuring 27.5cm x 100cm. Introduce the number line 0-50 first or join the two sections together to form an attractive Classroom Number Line 0-100. (27.5cm x approximately 2 metres). Different colours have been used to highlight each group of 10 numbers. This resource can be used for a whole class activity or by small groups of students to develop many skills.. counting, positional terms, and addition, subtraction and multiplication calculations. A dry erase marker is supplied to be used on the write on/wipe off laminated surface.