1. Significant Figures

2. ALL non-zero numbers (1,2,3,4,5,6,7,8,9) are ALWAYS significant.
Rule #1
ALL non-zero numbers (1,2,3,4,5,6,7,8,9) are ALWAYS significant.
Example
(4 sig fig)
(11 sig fig)

3. 2) ALL zeroes between non-zero numbers are ALWAYS significant. Example
Rule # 2
2) ALL zeroes between non-zero numbers are ALWAYS significant.
Example
(5 sig fig)
(5 sig fig)

4. All final zeroes to the right of the decimal place are significant
Rule # 3
All final zeroes to the right of the decimal place are significant
Example
(5 sig fig)
3,000, (8 sig fig)

5. Zeroes that act as place holders are not significant.
Rule # 4
Zeroes that act as place holders are not significant.
Example
300,000,000 (1 sig fig)
960 (2 sig fig)

6. Examples
508.0
807000