The rules for identifying significant figures when writing or interpreting numbers are as follows:
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).
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.
Leading zeros are not significant. For example, 0.00052 has two significant figures: 5 and 2.
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.
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With the decimal point, all digits are counted as significant figures. Then, there are 3 significant figures for the given number
With a decimal point, all digits for that number are counted. Then, we have 4 significant figures.
The number 0.022 has two significant figures. The leading zeros before the digits "2" are not counted as significant; they only indicate the position of the decimal point. Therefore, the significant figures are the "2" and the other "2" that follows it.
3 significant figures.
5 significant figures.