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What are Significant Figures?  In the measured value of a  physical quantity , the digits about the correctness of which we are sure plus the last digit which is doubtful are called the significant figures . significant figures For counting significant figures, we use the following rules: 1.All nonzero digits are significant. For example, x = 1234 has four figures. 2.All zeros occurring in-between the two nonzero digits are significant. For example, x= 20008 has five significant digits. 3.In a number without decimal, zeros on the right of nonzero digit are not significant. (However, when some value is recorded on the basis of actual  measurement , the zeros on the right of nonzero digit become significant. For example, m = 100 kg has three significant figures but x = 100 has only one significant digits.) 4.In a number with decimal, zeros on the right of the last nonzero digit are significant. For example, x = 1.58000 has six significant. 5.In a value less...