It is useful for people who are learning arithmetic or those who have not mastered it. It enables them to do simple sums. For people who have basic numeracy a number line has little to offer.
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Think of the numbers on the number line as years, months, or dates of the month. You could explain the event in a text box close to the corresponding date, then draw an arrow from the box to the location of the date on the number line.
The number can be equal to minus, zero or plus when plotted on the number line and two numbers plotted on the number line can have a range of numerical values.
the purpose of a number line is to help math.
what is 3.8 on number line
There is no such thing as an irrational number line.