How do you simplify 79 over 100?

Answer 1

Since the number 79 is prime, the proper fraction 79/100 cannot be simplified any further.

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The fact that 79 is a prime is neither a necessary nor sufficient condition for whether or not the fraction can be simplified.

3 is a prime, but 3/18 can be simplified: to 1/6. Conversely, neither 9 nor 10 are prime, but 9/10 cannot be simplified.

What is relevant is, not whether a number is prime, but that the numerator and denominator are relatively prime or, to put it more formally, that they are coprime. What this means is that these two numbers do not have a common factor other than 1.

GCF(79, 100) = 1 and that is why you have a fraction that cannot be simplified.