Dependability Curriculum Connection – Math
Significant digits and mathematical precision indicate how dependable a numerical answer can be. If you include more digits in your answer than what is significant for the data in the problem, then your answer is not dependable. If you round-off in an intermediate answer to a less significant digit than contained in your final answer, your answer is not dependable.
For more detail on this topic visit: http://www.thirteen.org/edonline/ntti/resources/lessons/significant/index.html