What do significant figures indicate in a measured value?

What do significant figures indicate in a measured value?

• A. The digits that contribute to precision and accuracy.
• B. The total number of digits in the number.
• C. The digits before the decimal point only.
• D. The number of measurements performed.

Answer: (A)

Significant figures show how precise a measurement is. The digits that are significant are the ones you can trust from the measurement, with the last one typically estimated. That’s why a value like 12.3 cm has three significant figures: the 1, 2, and 3 reflect the precision of the reading, not just the total number of digits. This concept isn’t about how many total digits appear, nor about how many times you measured something, nor are zeros simply “extra” digits; zeros contribute to significance depending on their position. In short, significant figures indicate the digits that carry information about what you know with confidence from the measurement—the precision of the value.

Significant figures show how precise a measurement is. The digits that are significant are the ones you can trust from the measurement, with the last one typically estimated. That’s why a value like 12.3 cm has three significant figures: the 1, 2, and 3 reflect the precision of the reading, not just the total number of digits. This concept isn’t about how many total digits appear, nor about how many times you measured something, nor are zeros simply “extra” digits; zeros contribute to significance depending on their position. In short, significant figures indicate the digits that carry information about what you know with confidence from the measurement—the precision of the value.