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1.
All nonzero digits in a measurement are significant.
3.176
Has 4 significant digits.
9
Has 1 significant digit.
79
Has 2 significant digits.
94.1721
Has 6 significant digits.
2.
All zeros between 2 nonzero digits are significant.
71.006
Has 5 significant digits.
40304.257
Has 8 significant digits.
92003.1
Has 6 significant digits.
507.7
Has 4 significant digits.
9030.022
Has 7 significant digits.
3.
Zeros to the right of a nonzero digit, but to the left of a decimal point are not significant unless a bar appears above the last significant zero.
405000
Has 3 significant digits.
405000 (bar over second zero from right)
Has 5 significant digits.
8300000 (bar over first zero from right)
Has 7 significant digits.
15000
Has 2 significant digits.
15000 (bar over second zero from right)
Has 4 significant digits.
4.
Zeros to the right of the decimal point but to the left of a nonzero digit are not significant.
0.0832
Has 3 significant digits.
0.002639
Has 4 significant digits.
0.0001
Has 1 significant digit.
0.0073
Has 2 significant digits.
0.000002
Has 1 significant digit.
5.
Zeros to the right of the decimal and to the right of a nonzero digit are significant.
478.00
Has 5 significant digits.
0.000080
Has 2 significant digits.
0.00491000
Has 6 significant digits.
46.10
Has 4 significant digits.
0.05270
Has 4 significant digits.
6.
When using scientific notation, the powers of ten are not significant.
3.5 x 10
14
Has 2 significant digits.
71.80 X 10
8
Has 4 significant digits.
432.00 X 10
2
Has 5 significant digits.
1.0 X 10
22
Has 2 significant digits.
6. X 10
76
Has 1 significant digit.