How many significant digits are there in 0.321?

Answer 1

3. Any number that is not a 0 is a significant number.

Rules for Significant Figures:

1. Non-zero numbers are always significant. (example: 1-9)

2. Zeroes between non-zeroes are always significant. (ex: the zero in 908 is significant)

3. All final zeroes to the far right of the decimal place are significant. (ex: the zeroes in 34.0 and 7.0 is significant)

4. Zeroes that act as place holders are not significant. (ex: the zeroes in 600 are not significant)

5. Zeroes before a decimal act as place holders and are not significant. (ex. the zero in 0.12 is not significant)