Computers and arithmetic have a great deal in common. *Arithmetical operations* are actually digital computer operations in which the numerical quantities are computed, either through adding, subtracting, multiplying, dividing, or otherwise comparing. *Arithmetical instructions* give a computer program direction to perform an arithmetic operation on specific types of data, such as addition, subtraction, multiplication, and division. The sections of the computer that carry out these computations and other logic operations are called *arithmetical units* (or arithmetic sections). (For more information about computers and math, see “Math in Computing.”)