1. Calculation with Significant Figures

2. 101. + 23.643 124.643 125 (accurate to ones place) 0.24 g/mL
General rule: The accuracy of answer is limited by the least accurate measurement involved in the calculation.
Rounding : 50/50
If 1st digit to be dropped is:
< 5 Round number to be rounded DOWN
> 5 Round number to be rounded UP
= 5 Round number to be rounded so it will be EVEN
Addition And Subtraction
Round answer to least number of decimal places (least accurate measurement).
101.
(accurate to ones place)
Multiplication And Division
Round answer to least number of significant digits found in measurements.
3.0 g / mL  =  g/mL
0.24 g/mL

3. (2.8 x 4.467) + 12.854 = ? Mixed Operations Follow PEMDAS
Apply Sig Fig rule once operation has been performed.
(2.8 x ) = ?