Computers are built using maths. Every program that is written for them generally uses a lot of math and math is the language that we use to communicate with computers. It thus becomes very perplexing that computer programs like calculator and Excel and powerful search engines too suck at maths. In fact, calculators have been known to screw up basic computations like 12.52 MINUS 12.51 (Windows 3.11 calculator actually returns the result as 0.00 instead of 0.01). We try to explain why computers suck at maths.