Significant Digits

When a number is expressed in Scientific Notation, the number of significant figures is the number ofDigits needed to express the number to within the uncertainty of measurement. For example, if aquantity had been measured to be , four figures would be significant. No more figures should be given thanare allowed by the uncertainty. For example, a quantity written as is incorrect; it should really bewritten as .

The number of significant figures of a Multiplication or Division of two or morequantities is equal to the smallest number of significant figures for the quantities involved. For Addition orSubtraction, the number of significant figures is determined with the smallest significant figure of all thequantities involved. For example, the sum is 115.7574, but should be written 115.8 (with rounding),since the quantity 5.2 is significant only to .

• Dirichlet Region
• Dirichlet's Boxing-In Principle
• Dirichlet's Box Principle
• Dirichlet Series
• Dirichlet's Formula
• Dirichlet's Lemma
• Dirichlet's Principle
• Dirichlet's Test
• Dirichlet's Theorem
• Dirichlet Structure Constant
• Dirichlet Tessellation
• Dirty Beam
• Dirty Map
• Disc
• Disconnected Form
• Disconnectivity
• Discontinuity
• Discontinuous
• Discordant Permutation
• Discrepancy Theorem
• Discrete Distribution
• Discrete Fourier Transform
• Discrete Mathematics
• Discrete Set
• Discrete Uniform Distribution