Scientific notations are commonly used as replacers for very big numbers, this is done in order to make the usage of big numbers easier.
9.972778 x10 ^6
One example of a number that you woul want to make simpler is 2,190,978. Before making this into a scientific notation you have to consider that in scientific notation numbers cant be smaller than 1 or bigger than 10.
To convert this number you have to move the decimal to the left for the number to be smaller than 10 but bigger than 1. This would give us 2.190978
After you have this number you have to add (x 10) and then the number of times you moved it to the left as a power.
2.190978 x10 ^6
Now that you know how to do this go out and try it by yourself!