Sig Figs

Why do we use significant figures?

• to make things more complicated

• all measurements contain some uncertainty

• to round numbers off to fewer digits

Which number has FOUR sig figs?

• 27.1 g

• 2710 g

• 0.02710 g

• 27,100. g

How many sig figs does this number have?

120.01 g

• two

• three

• four

• five

True or False:

Leading zeros are always significant.

• true

• false

Which of these is an example of an EMBEDDED (sandwich) zero?

• 206 mL

• 0.015 cm

• 28900 m

• 10. 10. g

All of the following have one significant figure except:

• 100 cm
• 0.0001 cm
• 2 cm
• 2.00 cm

Explain the difference between precision and accuracy.