1. A method of fused calculation of the sum of an addend and a product of two multiplicands, the addend and multiplicands being binary floating-point numbers represented in a standardized format as a mantissa and an exponent, wherein the multiplicands are in a lower precision format than the addend, with q>2p, where p is the mantissa size of the multiplicand precision format and q is the mantissa size of the addend precision format, the method comprising the steps of: multiplying the mantissas of the multiplicands using a p-bit multiplier; right-padding the 2p-bit product resulting from the multiplication with zeros to form a q-bit product mantissa; aligning the mantissa of the addend and the mantissa of the product based on the exponent values of the addend and multiplicands; and adding the aligned mantissas of the product and the addend.