Question

what is a significant figure?? how to count the number of significant figures??
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Answer 1

Significant figures are the number of digits in a value, often a measurement, that contribute to the degree of accuracy of the value.

Most exact numbers are integers: exactly 12 inches are in a foot, there might be exactly 23 students in a class. Exact numbers are often found as conversion factors or as counts of objects. Exact numbers can be considered to have an infinite number of significant figures.

Answer 2

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⇏Significant figures are the number of digits in a value, often a measurement, that contribute to the degree of accuracy of the value.

⇏There are three rules on determining how many significant figures are in a number: Non-zero digits are always significant. Any zeros between two significant digits are significant. A final zero or trailing zeros in the decimal portion ONLY are significant.