Calculatrice de Chiffres Significatifs — Formule

Significant Figures

Rules for Counting Significant Figures

1. All nonzero digits are significant (123 has 3 sig figs) 2. Zeros between nonzero digits are significant (102 has 3) 3. Leading zeros are NOT significant (0.0045 has 2) 4. Trailing zeros after a decimal point ARE significant (2.50 has 3) 5. Trailing zeros without a decimal point are ambiguous (1500 could be 2, 3, or 4)

Rounding to n Significant Figures

1. Find the first significant digit 2. Count n digits from there 3. Round at that position

Exemple Résolu

Round 123456.789 to 4 significant figures.

  1. The first significant digit is 1
  2. Count 4 digits: 1, 2, 3, 4
  3. The next digit (5) rounds up
  4. Result: 123500