Question

how are the significant digit are counted in a quantity?
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Answer 1

Answer:

START counting for sig. figs. On the FIRST non-zero digit.

STOP counting for sig. figs. On the LAST non-zero digit.

Non-zero digits are ALWAYS significant.

Zeroes in between two non-zero digits are significant. All other zeroes are insignificant.

Answer 2

Explanation:

Exercise 1: How many significant figures does each quantity have? For a decimal number that is less than 1, all figures are significant except the leading zeros after its decimal point. For example 0. ... The three zeros before 235 but after the decimal point do not count as significant.