We must round off the number 0.02056 in this question to three significant figures.
a) 0.0205
b) 0.0206
c) 0.021
d) 0.020
The answer to this question is (b), which equals 0.0206.
During the round off, we should keep in mind the following four key principles:
The importance of digits that are not zero
Significant zeros are those between two non-zero digits.
Leading zeros have no real meaning.
Only when a decimal point is present in the number are the trailing zeros significant.
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