A time line is a number line of years
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They both use numbers.
In telling the time. For example hours on a clock face, months in a year. Counting in dozens. In some mathematically challenged societies for lengths (feet into inches).
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Since the numbers on a number line increase from left to right, it follows that any number to the left of another number is smaller than that other number. Of course, most of the time it is quite obvious which of two numbers is larger, and we don't need to plot them on a number line to find that out.
no it has to be in years so if its in moths you divide that number by 12. if you can simplify 12 and that number. if the number is repeating when you divide you put a line over what number is repeating and multiply that time by the (P) and (R).