Scale factor is a type of number by which the size of a mathematical or geometrical figure can be changed with respect to the dimensions of the earlier figure. Scale factors are used to find the missing area, volume and length of the reduced shape or figure. It helps in changing the size of the figure and not the shape of it. For example, a square has a length of 5 units and a width of 2 units. If we increase the size of this square by 2 scale factors. The new length and width will be 10 and 4 units respectively.