The digits that are known reliably plus the first uncertain digit are known as significant figures or significant digits.
1. All non-zero digits are significant
2. All zeros between two non zero digits are significant
3. All zeros to the right of a non-zero digit but to the left of a decimal point are significant.
4. The number without a decimal point, the terminal or trailing zero(s) are not significant.
5. All zeros are significant if they come from a measurement
6. If the number is less than 1, the zero (s) on the right of the decimal point but to left of the first non zero digit are not significant.
7. All zeros to the right of a decimal point and to the right of non-zero digit are significant.
8. The number of significant figures does not depend on the system of units used
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