ANSWERS TO SIGNIFICANT PROBLEMS

 

1.  For each of the following numbers, indicate the number of significant figures:

 

number

number of significant figures

rule #

a)

541.2

4

1

b)

23,459

5

1

c)

2,034

4

2

d)

1.0009

5

2

e)

65.0

3

3

f)

202.0

4

2,3

g)

0.045

2

4

h)

0.0080

2

3,4

i)

4,320

3

5

 

2.  Do the following calculations and record the answers with the correct number of significant figures:

            a)  3.29 g/6.15 cm3  =  0.530 g/cm3  (3 significant figures)

            b) 2.04 kg + 6.13 kg + 18.92 kg  =  27.09 kg  (4 significant figures; to hundreths place)

            c)  5.23 cm x 38 cm  =  2.0 cm2   (2 significant figures)

            d)  18.25 g - 3.9 g  =  14.4 g   (3 significant figures; to tenths place)

            e)  1.283 m x 4.5 m  =  5.8 m2  (2 significant figures)