👉 In mathematics, "lengthening" is a mathematical concept that refers to the process of extending or adding another quantity to an existing object. For example, if you have two lengths, 3 and 5, and you want to extend them by adding another length, you can do so by multiplying both lengths together. For instance, let's say you have a rectangular box with dimensions 4x6x2 cm. If you want to add an extra dimension of width (4+1=