Significant Digits

Rules §

• All non-zero numbers are significant
• Zeros before the first digit are not significant (0.0015 only has 2 Significant Digits)
• Zeros between other digits are significant (1005 has 4 significant digits)
• Zeros after other digits following a decimal place are significant (5.30 has 3 Significant Digits)
• Zeros at the end of a number are significant only if indicated by scientific notation 4.1 * 10${}^3$ has 2 Significant Digits 4.10 * 10${}^3$ has 3 Significant Digits 4.100 * 10${}^3$ has 4 Significant Digits 4.01 * 10${}^3$ has 2 significant digits