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1. All non-zero digits are significant. For example, 295 has three significant figures.

2. Leading zeroes in front of a decimal are not significant. For example 0.295 has three significant figures.

3. Zeroes between other significant figures are significant. For example 2095 has four significant figures.

4. Trailing zeroes after a decimal are significant. For example 295.0 has four significant figures. And 2950 has three significant figures because the trailing zero does not occur after a decimal.

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Q: What is the rules for determing rignificant figures?
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