I am not sure at what you are getting at, but fractions are a math component.
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they use math by counting doses, and they also used fractions, decimals, and basic arithmatic.
When you want to add or subtract unlike fractions.
A line plot can be made using fractions. Just use fractions rather than whole numbers or other data to mark the scales of the horizontal axis and vertical axis
Because most people find it easier to work with fractions involving small numbers rather than equivalent fractions involving large numbers. They would rather use 1/6 than try to work with 261/1566.
Remainders (on division) rather than division itself.