Because simplification allows you to work with smaller numbers.
Most people would glaze over if faced with the fraction 1598732/3197464 but, if you have the patience, it simplifies to 1/2 which many will be quite happy to work with.
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If it is an Improper Fraction then you have to simplify which is the same thing is reducing.
To simplify a fraction, you find a number that can be divided by the fraction you are simplifying. sometimes this does not always work and the fraction can not be simplified.
you know that .78 is out of 1 so its also78/100that is a fraction but you can simplify it to39/5039/50
If it says to and if it can, like 8 can, to 4/5. ---- 10
Simplify the fraction for your answer