Question: how to calculate antilog of a negative number?
Answer: First convert the negative number in to two parts one negative ( characteristic) and the decimal part( Mantissa) into positive. For example, lets take antilog of -7.5231 by adding +8 and subtracting -8 as follows : -7.5231 +8 - 8 = -8 + (8-7.5231) = -8+ 0.4769.