Question

how to find 4 irrational numbers between 12/16 and 14/16

Answer 1

The decimal of 12/16 is 0.75 while decimal of 14/16 is 0.875
So your number should be bigger than 0.75 and less than 0.875

Now you can form a pattern behind that number which is non repeating and non terminating
like
0.7511211122111122..
Now you know that none of this is repeating and you know that it will not terminate but you can't make like this one
0.75121212..
because it's repeating