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Chapter 8—Measurements 84 Significant Digits
Rules For Significant Digits  Digits from 19 are always significant.
Examples  256 has three significant digits, 256
 12.56 has four significant digits, 12.56
 Zeros between two other significant digits are always significant
Examples  205 has three significant digits, 205
 0.3008 has four significant digits, 0.3008
 30.2 has three significant digits: 30.2
 26007 has five significant digits: 26007
 Zeros to the right of both the decimal place and another significant digit are significant.
Examples  2.400 has four significant digits 2.400
 0.05300 has four significant digits: 0.05300
 Zeros used solely for spacing the decimal point (placeholders) are not significant.
85.004 
 0.01566 has five significant digits: 0.01566
 0.0004 has one significant digit: 0.0004
 0.072 has two significant digits: 0.072
