hexadecimal Calculator add decimalism same ， both are same number Number Phase addition and subtraction，只不过 hexadecimal It's full 16 carry。 for example ：DFH+02H， Calculator ：F+2, full carry 1, remaining 1, D+O=D, plus carry 1, becomes E, so the Results are E1H. That's not a mistake. The "H" stands for hexadecimal, of course, and calculate

。