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The rules for identifying significant figures when writing or interpreting numbers are as follows:

1. All non-zero digits are considered significant. For example, 91 has two significant figures (9 and 1), while 123.45 has five significant figures (1, 2, 3, 4 and 5).

2. Zeros appearing anywhere between two non-zero digits are significant. Example: 101.1203 has seven significant figures: 1, 0, 1, 1, 2, 0 and 3.

3. Leading zeros are not significant. For example, 0.00052 has two significant figures: 5 and 2.

4. Trailing zeros in a number containing a decimal point are significant. For example, 12.2300 has six significant figures: 1, 2, 2, 3, 0 and 0. The number 0.000122300 still has only six significant figures (the zeros before the 1 are not significant). In addition, 120.00 has five significant figures since it has three trailing zeros.

Q: What are the rules of significant digits?

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the precision of the answer must have the same number of significant digits as the measurement with the least significant digits- the site explains the rules and how to identify significant digits

Five. All nonzero digits are significant and zeros in between significant digits are always significant.

Five. All nonzero digits are significant and zeros in between significant digits are always significant.

Four - zeros between significant digits are significant.

The 1st four digits are significant

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the precision of the answer must have the same number of significant digits as the measurement with the least significant digits- the site explains the rules and how to identify significant digits

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The rules of "significant figures" tell you how many of the digits in your answer can be trusted and how many are trash. Without knowing those rules, you may get an answer with 15 digits in it, and think that you have the greatest answer there could be, and not realize that the last 12 digits are wrong and don't mean anything.

If two numbers have m and n significant digits, respectively, then then product can have at most m+n. However, the normally it is the minimum of m and n.

If they did not use rules all their calculations would simply lead to random digits!

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Five. All nonzero digits are significant and zeros in between significant digits are significant.

Five. All nonzero digits are significant and zeros in between significant digits are always significant.

Four - zeros between significant digits are significant.