A number in standard form - aka scientific notation - looks like this :

Where a is a number between 1 and 9

and n is the number of times a must be multiplied by ten to get back to the original number.

If n is negative, then a is divided by ten a total of n times.

Examples :

Converting ordinary numbers (floating point) to Standard Form :

Converting from Standard Form back to ordinary numbers :

The number must be between 1 an 9, otherwise it is Engineering form:

What distance is travelled by an object which travels for 4 hours at a speed of 5 X 10^{2} km/h ?