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What is the definition of a significant number?

Updated: 8/16/2019
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13y ago

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The digits of a value which can be used with accuracy with other values.

ie- you have two measurements, 13.6mg and 15.716mg.

The most digits you can use are 3, because 13.6 has an accuracy of 3 digits.

If you used 5 digits, accuracy would be limited because you do not know/have the 4th and 5th digits of the first value.

When a a significant digit is followed by an exact 5, round to the nearest even digit.

ie- 2.03g and 3.045g

You have 3 significant digits, so 3.04g is rounded to 3.04g. If it were 3.055g, it would get rounded to 3.06g.

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Q: What is the definition of a significant number?
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