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Significant figures are the digits which give us useful information about the accuracy of a measurement

Rule 1: Non-zero digits are always significant.e.g. The number 22.22 has FOUR significant figures because all of the digits present are non-zero.

Rule 2: Any zeros between two significant digits are significant.The number 11.2 has THREE significant figures because all of the digits present are non-zero. e.g.3021 has FOUR significant figures. The zero is between a 3 and a 2.

Rule 3: A final zero or trailing zeros in the decimal portion ONLY are significant.e.g There are FOUR significant figures in 32.00. It is different from 32 It's important to understand that "zero" does not mean "nothing." Zero denotes actual information, just like any other number. we cannot tag on zeros that aren't certain to belong there.

Rule 4: Leading zeros are NOT significant. e.g The number 0.0032 also has TWO significant figures. All of the zeros are leading.

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