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HeyGuysItsRach
You have to find a common divisor between the numerator and denominator. You find out that 27 and 243 are both divisible by 3. 27/3 = 9 and 243/3 = 61, therefore 27/243 = 9/61. 61 is a prime number, so 9/61 is the fully simplified version of 27/243.