Answer:
(1) Since, a number which has only two factors, one and itself is called a prime number,
Now, the factor of 12 are 1, 2, 3, 4, 6, 12.
By the above numbers 3 is the largest prime number,
Hence, the largest prime factor of twelve is 3.
(2) Here, the given fraction,

We know that a fraction in which denominator > numerator is called proper fraction otherwise it is called improper fraction,
The simple form of the above fraction is,

13 > 3,
⇒ Given fraction is an improper or mixed fraction.