Five, because the trailing 0s should not still be there if they were not significant.
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It has 3 significant digits.
3 significant figures
The significant digits in a number can be arbitrarily small or large in number, according to the method of creating them.Numbers that can have an infinite number of possible significant digits are called transcendental numbers.
As a result of the rule that you use the definition of the term - such as significant digits - when finding them for a number.
The least number of significant figures in any number of the problem determines the number of significant figures in the answer.