To put a number in scientific notation, you must simplify it to become a number between 1-10 and multiply it by 10 up to the number of spaces the decimal was moved to simplify the number.
For example, to put the number .000000000006789 in scientific notation, you must move the decimal 12 times ( I think) to make the number 6.789 x -10up to the 12, be cause you have to move the decimal backwards.
To do another, 0.1 in scientific notation becomes 1 x 10up to the 1.
4 doesn't need to be in scientific notation, as it is already a number between 1-10. However, if you were to do it, it would become 4 x 10up to the 0.
For one more example, 78000000000000000 in scientific notation becomes 7.8 x 10up to the 15.
