Answer:
0.5, pi/2, square root of 4, and im assuming you meant to put 3.4 for the first number so that is the greatest number.
Explanation:
set 0.5 and 3.4 aside since they are normal numbers. the square root of 4 is 2 since 2 squared = 4. to figure out pi/2, divide 3.14 by 2 (3.14 is pi) which is 1.57.