How to scientific notation to express the number 480 into 1 scientific notaion?

Consider the number 480 in expanded form:

... 480 = 4*100 + 8*10

The left-most digit and multiplier are those that correspond to the ones you use in scientific notation ... You recall that 100 = 10*10 = 10². All this means is that

... 480 = 4.8*10²