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**There are three rules on determining how many significant figures are in a number:**

- Non-zero
**digits**are always**significant**. - Any zeros between two
**significant digits**are**significant**. - A final zero or trailing zeros in the decimal portion ONLY are
**significant**.

Also know, what are the 5 Rules of significant figures?

**Significant Figures**

- Annotation category:
- RULES FOR SIGNIFICANT FIGURES.
- All non-zero numbers ARE significant.
- Zeros between two non-zero digits ARE significant.
- Leading zeros are NOT significant.
- Trailing zeros to the right of the decimal ARE significant.
- Trailing zeros in a whole number with the decimal shown ARE significant.

**100**with three

**significant figures**(implying an uncertainty of ), you could write it as

**100**. (with a trailing decimal point) or, less subtly, as , or (even better) with an explicit uncertainty such as or “

**100**to three

**significant figures**”.

Consequently, how many significant figures does 10.0 have?

two significant digits

Answer: the **significant figures** of the number **0.0560** is 3.