Do calculators have floating point error? As a programmer, we have been told about floating points errors on computer. Do Calculators have floating point error too?
Example. 
0.1 (display) = .0999999998603016  (actual value used) on computers

Not really 0.1 But you can see it is close.

They do as long as you don't use one that uses symbolical calculations like the modern TI or Casio calculators. 
One way to see it is to calculate iteratively roots of a number and then square the results again, if you do it often enough you will get a different result than the input due to numerical errors, this doesn't only have to do with the floating point representation but also with inaccurate root algorithms used in the calculator.
