4/5, do you see a common whole number that will evenly divide (with zero remainder) 4 and 5. The answer is "NO", so 4 over 5 is in its simplest form.
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You can tell that 4/5 is in its simplest form because 5 is a prime number. The 5 is not evenly distributed unless it is by itself or the number 1.
4 over 5 is in simplest form.
4/19 is in its simplest form.
4/5 is in its simplest form.
4 over 70 in the simplest form is 2 over 35