📖 Significant figures rules
• Rounding: Non-zero digits are always significant; zeros between non-zero digits count; leading zeros never count; trailing zeros after decimal count.
• Addition/Subtraction: result rounded to the least number of decimal places of any operand.
• Multiplication/Division: result rounded to the least number of significant figures of any operand.
• This tool uses standard scientific rounding (≥5 rounds up).
• Scientific notation is used for very large/small results automatically.
• Rounding: Non-zero digits are always significant; zeros between non-zero digits count; leading zeros never count; trailing zeros after decimal count.
• Addition/Subtraction: result rounded to the least number of decimal places of any operand.
• Multiplication/Division: result rounded to the least number of significant figures of any operand.
• This tool uses standard scientific rounding (≥5 rounds up).
• Scientific notation is used for very large/small results automatically.