Simply open the document and project image for the class to see. Use your up and down arrows to move along the number line. Students will only see a portion at a time, but THAT'S GREAT! This allows for the perfect opportunity for teachers to ask students which numbers should come next and which numbers are before.
Traditional number lines run left to right, and number grids usually follow a left to right progression as well which can be confusing for some students. Vertical number lines are helpful, but often cannot continue past 20 or 30 due to space. This number line begins at 1 and progresses all the way to 120 with numbers growing larger the higher you climb on the number line much line a thermometer!