Significant Digits    Answers
Practice Problems Level 3
1.  How many significant digits are there in each of the following measurement?
a.   307 g
f.    350,000 cm
b.   1.40082 cm
g.   180.00 s
c.   0.00058900 g
h.   3.50 X 103 cm
d.   0.00300900870 mm
i.    1.604 X 10-4 m
e.   4500 km
j.    0.0459 X 103 g


2.  Express the answer to each of the following calculations with the correct number of significant digits.
a.   80 cm + 13.0 cm
f.    750 cm  -  677.4 cm
b.   72.60 m + 0.0950 m
g.   10,000 m - 940 m
c.   13.89 cm + 6.8932 cm
h.   0.0890 cm - 0.0666 cm
d.   1.30 X 10-2 cm + 2.4 X 10-4 cm
i.    0.340 X 10-1 g - 1.20 X 10-2 g
e.   8.99 X 103 m + 1.400 X 104 m
j.    4.5 X 105 km - 3.00 X 103 km


3.  Express the answer to each of the following calculations with the correct number of significant digits.
a.   3.0 cm X 4.000 cm
f.    0.0045 mm2 ÷  0.90 mm
b.   2.005 cm X 5.0 cm
g.   120 km2  ÷  8.56 km
c.   400 m X 87,488 m
h.    0.7600 mm3  ÷  1.50 mm
d.   2.3 X 10-6 m X 1.45 X 10-2 m
i.    4.80 X 105 m2  ÷  8.5 X 103 m
e.   8.70 X 10-2 mm X 40 X 10-1 mm
j.    0.630 X 10-1 m ÷  0.0804 X 102 m