Download Rules for recognizing significant figures 1. Non-zero numbers

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Rules for recognizing significant figures
Non-zero numbers are always significant. (72.3 g has three)
Zeros between non-zero numbers are always significant. (60.5 has
three)
All final zeros to the right of the decimal place are significant. (6.20 g
has three)
Zeros that act as placeholders are not significant. Convert quantities to
scientific notation to remove the placeholder zeros. (0.0253 g and 4320
g each have three)
Counting numbers and defined constants have an infinite number of significant figures. (6 molecules, 60 s = 1 min)
Rules for rounding numbers
In the example for each rule, there are three significant figures.
1. If the digit to the immediate right of the last significant figure is less than
five, do not change the last significant figure. 2.532  2.53
2. If the digit to the immediate right of the last significant figure is greater
than five, round up the last significant figure. 2.536  2.54
3. If the digit to the immediate right of the last significant figure is equal to
five and is followed by a nonzero digit, round up the last significant figure.
2.5351  2.54