# Exercise 2 | Chemistry and the Scientific Method

State the number of significant figures of the following numbers:

501

0.0004

9.00

5.3 x 108

0.00700020

100

100.

020.0

501  ⇒ 3 significant figures

0.0004 ⇒ 1 significant figure

9.00 ⇒ 3 significant figures

5.3 x 108 ⇒ 2 significant figures

0.00700020 ⇒ 6 significant figures

100 ⇒ we cannot tell: it could be 1, 2 or 3 significant figures

100. ⇒ 3 significant figures

020.0 ⇒ 3 significant figures