The floating-point blasphemy on display here would make any self-respecting mathematician hyperventilate. Computer scientists casually multiplying 1.1 by 1.1 and getting 1.21000000000002 instead of the mathematically pure 1.21 is the digital equivalent of fingernails on a chalkboard to the pure math crowd.
Welcome to the wonderful world of binary approximations of decimal numbers! Your calculator isn't broken—it's just speaking computer. While engineers shrug this off as "close enough for government work," mathematicians are having existential crises in the corner. Precision is their religion, and floating-point errors are the ultimate heresy.