1-23Try solving a few subtraction problems by using the complement method:Q21.Subtract:Q22.Subtract:Q23.Subtract:OCTAL NUMBER SYSTEMThe octal, or base 8, number system is a common system used with computers. Because of itsrelationship with the binary system, it is useful in programming some types of computers.Look closely at the comparison of binary and octal number systems in table 1-3. You can see thatone octal digit is the equivalent value of three binary digits. The following examples of the conversion ofoctal 225_{8} to binary and back again further illustrate this comparison: