Some basic principles Read about . . .
Yes, it is a big number, but it is not possible to appreciate just how big it is at a glance. The above number then becomes 4 . The '13' is known as an 'index number' and most people finish up remembering that the index number shows how many places the decimal point has to be moved to the right putting in the 0's as necessary. And it works. The great merit of this system for users is that the associated arithmetic becomes very easy.