I mounted the 0-50 portion of this 0-120 number line under my white board for ease of use by my students while on the carpet doing math activities. I mounted the whole 0-120 number line up higher above the windows. It takes up little space but makes a BIG impact on student success. Each rectangles is 1 inch high and 1.5 inches wide. Students can practice counting by 5's (red numbers) and 10's (blue outlines). Laminate it and it makes a great teaching tool for use with dry erase markers too!