9/13 is already as simplified as it is going to get because 13 is prime.
31/61 is a simplified fraction because 31 and 61 are both prime numbers.
No - since 11 is a prime number, the proper fraction 11/40 is as simplified as it can be.
23/60 and as 23 is a prime number the fraction can not be further simplified.
Since the denominator of the fraction 9/11 is prime, the fraction is already expressed in its simplest form.
No, 19 is prime and if you ever have a prime number in a fraction, the fraction can not be further simplified (reduced).
Since the numerator of the fraction 19/36 is prime, the fraction cannot be simplified any further.
A fraction in which the numerator and denominator are co-prime.
Sometimes. 13 is a prime number. 13/26 can be simplified to 1/2. But 13/15 cannot be further simplified.
9/13 is already as simplified as it is going to get because 13 is prime.
79 is prime 79/100
31/61 is a simplified fraction because 31 and 61 are both prime numbers.
No - since 11 is a prime number, the proper fraction 11/40 is as simplified as it can be.
If either of the numbers are prime, then the fraction cannot be further simplified. 5 is prime, therefore 5/42 is fully simplified.
23 is a prime number. It does not divide evenly into 70. For these two reasons, this fraction can not be simplified any further than 23/70.
13/78 cannot be simplified. 13 is a prime number and it will not divide evenly into 78.
42 and 5 are co-prime so the fraction cannot be simplified.