66.6 + 33.4 is now 2^6 times:
   1.0000101001100110011001100110011001100110011001100110
+  0.1000010110011001100110011001100110011001100110011010
---------------------------------------------------------
   1.1001000000000000000000000000000000000000000000000000

66.7 + 33.3 is now 2^6 times:
   1.0000101011001100110011001100110011001100110011001100
+  0.1000010100110011001100110011001100110011001100110011
---------------------------------------------------------
   1.1000111111111111111111111111111111111111111111111111