Question 1161579: Give the correct number of significant figures for 2500, 2500., 0.0043, 0.06050
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Answer by Edwin McCravy(20055)   (Show Source):
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A 0 is said to be "an introductory 0" if there are no non-zeros anywhere to the left of it.
A 0 is said to be "an intermediate 0" if there is a non-zero digit somewhere
to the left of it, AND also a non-zero digit somewhere to the right of it.
A 0 is said to be "a trailing 0" if there are no non-zeros anywhere to the right of it.
All digits are SIGNIFICANT except 0's, which are sometimes significant
and sometimes not, according to the following rules.
Rules:
1. Non-zeros are ALWAYS significant.
2. Intermediate 0's are ALWAYS significant.
3. Introductory 0's are NEVER significant.
4. Trailing 0's are significant if the decimal point shows.
5. Trailing 0's are NOT significant if the decimal point DOES NOT show.
2500 has 2 significant digits by rules 1 and 5.
2500. has 4 significant digits by rules 1 and 4.
0.0043 has 2 significant digits by rules 1 and 3.
0.06050 has 4 significant digits by rules 1, 2, 3, 4.
Edwin
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