1.908E6. Count the digits following the first: 6. You only count the digits up to the decimal point. [1908000 has no decimal point (it's actually invisible or hidden after the last zero).] This tells you what to put after the "E". Then you write the number with the first digit in front of the decimal point and the rest of the digits after the decimal point. You can leave out any trailing zeroes. The number has 3 trailing zeroes.