This fun topic -- numeric precision in SAS -- comes up quite a bit.  Jaap is correct: floating point math in computers is not the same as if you worked it out by hand.  There is an IEEE standard for how floating point numbers are represented in computers, and SAS follows that standard. More here: http://blogs.sas.com/content/sasdummy/2012/03/01/precision-in-sas-numbers/ Also this fun one: what is the difference between 0 and -0? Chris ... View more