need help rounding

[jefsummers]

Not sure why round is not working for you. I made up some data for list1 and list2 and ratio. Your version as posted:

list1 = [2.2,6.1,7.7,10]
list2 = [12.345,23.456,34.567,5]
ratio = 3.1415926535
items = len(list1)
for n in range (0,items,1):
    print("\t\t\t",(list1[n]),end = "\t\t\t\t")
    print((float(list1[n]) * ratio),("\t"),list2[n]) 

Output:
			 2.2				6.911503837700001 	 12.345
			 6.1				19.16371518635 	 23.456
			 7.7				24.19026343195 	 34.567
			 10				31.415926535 	 5

Now, properly put round

list1 = [2.2,6.1,7.7,10]
list2 = [12.345,23.456,34.567,5]
ratio = 3.1415926535
items = len(list1)
for n in range (0,items,1):
    print("\t\t\t",round(list1[n],2),end = "\t\t\t\t")
    print(str(round(float(list1[n]) * ratio,2))+"\t"+str(+round(list2[n],2)))

Output:
			 2.2				6.91	12.35
			 6.1				19.16	23.46
			 7.7				24.19	34.57
			 10				31.42	5

There are a number of other issues in your code snippet - the range operator for one could be dropped back to range(items), or even better
do for item in list1 and change the subsequent code, but will leave to you.