A method is provided for multiplying a first operand comprising at least two X-bit portions and a second operand comprising at least one Y-bit portion. At least two partial products are generated, each partial product comprising a product of a selected X-bit portion of the first operand and a selected Y-bit portion of the second operand. Each partial product is converted to a redundant representation in dependence on significance indicating information indicative of a significance of the partial product. In the redundant representation, the partial product is represented using a number of N-bit portions, and in a group of at least two adjacent N-bit portions, a number of overlap bits of a lower N-bit portion of the group have a same significance as some least significant bits of at least one upper N-bit portion of the group. The partial products are added while represented in the redundant representation.