When do you use a vertical number line?

A vertical number line is used to represent numerical values in a clear and organized manner, typically when dealing with integers, fractions, or other ordered sets of numbers. It is particularly useful for illustrating concepts like positive and negative numbers, the distance between values, or the concept of absolute value. Vertical number lines can also aid in visualizing changes in quantity, such as temperature fluctuations or elevation levels. Additionally, they help in teaching mathematical operations like addition and subtraction.