Sig Fig Guides
Everything you need to master significant figures. Start with the counting rules, then learn how to apply them in calculations.
What Are Sig Figs?
Start here if you need the meaning of sig figs, why they matter, and how to recognize them in real numbers.
Significant Figures in Chemistry
Learn how sig figs work in chemistry measurements, lab calculations, unit conversions, exact numbers, and final answer rounding.
Decimal Places vs Significant Figures
Know when to round by decimal places, when to use significant figures, and why the rule changes by operation.
Significant Figures in Scientific Notation
Learn why only the coefficient counts, how E notation works, and how scientific notation removes trailing-zero ambiguity.
Exact Numbers and Significant Figures
Decide when counts, definitions, and conversion factors are exact and when measured values limit your final answer.
Significant Figures Worksheet
Print a worksheet with counting, rounding, calculation, mixed-operation problems, and an answer key.
Complete Sig Fig Rules
Master all 5 rules for counting significant figures. The foundation for everything else.
How Many Significant Figures?
50+ examples showing how many sig figs are in any number. Quick answers with explanations.
Rounding Significant Figures
Learn how to round to any number of sig figs. Step-by-step process with examples.
Addition & Subtraction Rules
Learn how to add and subtract with sig figs. Focus on decimal places, not sig fig count.
Multiplication & Division Rules
Master multiplying and dividing with sig figs. Round to the fewest significant figures.