Basic subtraction error

[buran]

Firts, your original code - no need to wrap input() function in str(). input() returns str in any case.

As suggested by jefsummers - you can use Decimal, instead of float

from decimal import Decimal
var1=Decimal(input("What is Var1?"))
#For example user inputs 8.10
var2=Decimal(input("What is Var2?"))
#For example user inputs 6.80
var3 = var1 - var2
print(var3)

Another option is to use string formatting when printing the result of deduction

var1=float(input("What is Var1?"))
#For example user inputs 8.10
var2=float(input("What is Var2?"))
#For example user inputs 6.80
var3 = var1 - var2
print(f'{var3:.2f}')