 Significant Figures, Significant Digits,
a selection of answers from the Dr. Math archives.
 Significant Digits
 What are significant digits?
 Significant Digits and Zero
 When are zeros significant and when are they not significant?
 Significant Figures
 Why does 62.3 * 5.7 = 360 and not 355?
 Rules for Significant Figures
and Decimal Places
 Accurate measurement: What are significant digits?
When do we use them? Why?
 Rounding to Specific Number
of Significant Figures
 How do I round to five significant figures?
 Significant Digits in
Measurement
 I understand that there are rules to determine the significant
digits in measurement, but aren't all digits significant, especially
zeros for place value?
 How Many Significant Digits?
 Why does 5030 have three significant digits and 5030. four?
 What is a Significant Digit?
 I came across a question asking for an answer with no more than
"2 significant digits"  can you please explain what a significant digit is?
 Calculations Involving
Significant Figures
 My physics class is having a fair amount of trouble with
significant digits.
 Rounding 389.512 to Three
Significant Digits
 On the one hand, 390 is the closest multiple of 10 to 389.512;
on the other hand, it is the closest whole number to 389.512.
