1. A multiplication module for multiplying a multiplicand and a multiplier each being a binary-coded decimal number of a single decimal digit, for use in a decimal multi-digit multiplying assembly, said multiplication module comprising: an input group for receiving a signal group including said multiplicand, said multiplier and a carry of a binary-coded decimal single digit; multiplication table means having decimal data representing a sum of a product resulting from a multiplication of said multiplicand by said multiplier and said carry for each possible digit of said multiplicand, multiplier and carry; retrieving means responsive to said signal group for retrieving said decimal data from said multiplication table means, first outputting means for outputting a high-order decimal digit of said decimal data retrieved by said retrieving means; and second output means for outputting a low-order decimal digit of said decimal data retrieved by said retrieving means.