Standard form of a number is the the form where the number is expressed in the number digit form. There are many techniques to convert a same number into standard form.
There are many ways of writing a number in expanded form.
Rectangle: P = 2 (L+W) but length is 2 meters longer than wide then L = W + 2, So P = 2 (L + W) 24 = 2(W+2+W) 24 = 2 (2 + 2W) 24 = 4 + 4W So 4W = 24 -4 =20 W = 20/4= 5, L = 5+2= 7