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 m3   ÷  0.0804 X 102 m