Numbers line

An accessible numbers line made for visually impaired students which enables them to identify different groups of numbers and find relations between them.The idea of ​​the number line, is that it was engraved on a wooden ruler and it is a horizontal cheek that extends left and right to express positive numbers and negative numbers.
 
How To Use:
 
By following the arrow from the center to the right, this indicates an increase in the numbers. If you go from the center to the left, it indicates a decrease in the numbers. The middle is a congruence of the two sides, but differently The right signs for positive numbers and left for negative numbers. And pins can be installed at any of the points found to see the link or difference between the two numbers.