Hopefully none of them (at least none that use floating point arithmetic). When you convert the equation to the exponent notation you get this: (1.2x2^-2) - (

Hopefully none of them (at least none that use floating point arithmetic). When you convert the equation to the exponent notation you get this: (1.2x2^-2) - (1.6x2^-3) = (1.6x2^-3) - (1.6x2^-4) which is pretty clearly false. http://www.h-schmidt.net/FloatConverter/IEEE754.html http://www.h-schmidt.net/FloatConverter/IEEE754.html has a pretty nice conversion tool, if you're curious.