Arkansas State University
Department of Chemistry
and Physics
Answers - Worksheet 2
Scientific Notation/Significant Figures

1. Convert each of the following into scientific notation. 

 7.27 x 102

 1.72000 x 105

 9.84 x 10-4

 2.000 x 104

 1.4

 2.560 x 1033

2. Convert each into decimal form.

 15600 + 100

 0.036

 73690000 + 10000

 590 + 10

 0.000059

3. Calculate the following.  Give the answer in correct scientific notation.

 a)   9.434 x 1066                  b)  - 8.87 x 102

4. Calculate the following.  Give the answer in correct scientific notation.

 a) 7.16 x 1020          b) 1.1025 x 10130

5. Give the number of significant figures in each of the  following.

 a)  1.05 g      3

 b)  0.0003040 mm     4

 c)  29000 + 10 ft     4

 d)  0.90 x 1045 L    2

 e)  the number of eggs (12) that make up a dozen  infinite

6. Determine the answer for each of the following.  Be sure to  use the correct number of significant figures.

a)   45.3                                                             b)  5.04

c)  9.9 x 103                                                      d)  3

7. Round each of the following to 3 significant figures.
 
77.1  6.30 x 106
0.000234 10.2
2.90 x 1021