Mathematics

Ignoring Floating Point Arithmatic, there are two types which are used either explicitly or implicitly in high level commercial applications, and these are:

Decimal Arihmatic.

Used extensively in financial applications, and is performed on data held in memory.

Binary Arithmatic

This is used for array processing and address manipulation; and is performed on data held in Registers. Subscipting in COBOL or PLI is an implicit use of Binary Arithmatic.

Some Arithmatic instructions.

Decimal Arithmatic
Instruction	Description
AP	Add a number at one memory location to a number at another location.
DP	Divide a number at one memory location by a number at another location.
MP	Multiply a number at one memory location with a number at another location.
SP	Subtract a number at one memory location from a number at another location.

Binary Arithmatic
Instruction	Description
A, AH	Add the contents of a 4 or 2 byte memory location to the contents of a Register.
AR	Add the contents of two Registers.
D, DR	Divide the contents of a Register by the contents of a 4-byte memory location, or divide the contents of two registers.
M, MH	Multiply the contents of of a Register by the contents of a 4 or 2 byte memory location.
MR	Multiply the contents of two Registers.
S, SH	Subtract the contents of a 4 or 2 byte memory location from the contents of a Register.
SR	Subtract the contents of two Registers.