1. How many Sig Figs? Start counting sig figs at the first non-zero.
All digits except place-holding zeroes are sig figs.
Measurement
# of Sig Figs
0.115 cm 3 cm 2 cm cm cm 5
Measurement
# of Sig Figs
234 cm 3
67000 cm 2 _
45000 cm 4
560. cm cm 5

2. What Precision?
A number’s precision is determined by the furthest (smallest) place the number is recorded to.
6000 mL : thousands place
6000. mL : ones place
mL : tenths place
5.30 mL : hundredths place
8.7 mL : tenths place
mL : thousandths place

3. Rounding with addition and subtraction
Answers are rounded to the least precise place.

4. Rounding with multiplication and division
Answers are rounded to the fewest number of significant figures.

5. Metric Conversions
Determine how many powers of ten difference there are between the two units (no prefix = 100) and create a conversion factor. Multiply or divide the given by the conversion factor.
How many kg are in 38.2 cg?
(38.2 cg) /( cg/kg) = km
How many mL in dL?
(0.988 dg) X (100 mL/dL) = 98.8 mL