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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Use the rules of significant figures to answer the following : 22.674 * 15.05. Answer: 341.2
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You count the number of figures from left to right starting with the first number different from 0. Example: 205 has 3 significant figures 0.0000205 has 3 significant figures 0.000020500000 has 8 significant figures
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If they did not use rules all their calculations would simply lead to random digits!