This unit deals with the arithmetic instructions used with the 8086 processor.
These are as follows:
ADD and ADC used for adding
INC used for incrementing,
SUB and SBB used for subtracting
DEC used for decrementing

All these instructions operate on values in single registers, memory or constants.
They can also be combined to handle larger values that require two registers for storage.

The 8086 family of processors uses different multiplication and division instructions for signed and unsigned integers.

IMUL for signed multiplication
IMUL for signed division

Multiplication and division instructions have also special requirements depending on the size of the operands and the processor the code runs on.