What does scientific notation allows us to do?
Scientific notation rewrites large numbers like 2,305,000,000,000 to
Because the accuracy of measurements are to some degree an estimation (instruments have a limited accuracy), not all digits carry true "significance" or meaning. Of more concern, especially when dealing with very large or very small numbers (distances between stars or sizes of atoms), the leading digit and the place value of that leading digit are of most importance. Scientific notation makes these values very easy to "see."