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To count significant figures, you count all the non-zero digits. You also count zeros which are between non-zero digits, as well as zeros which are after the decimal point, only if they appear to the right of non-zero digits.
0.1020 is a number to 4 significant figures. The rule is that "Zeros must be kept to show the position of the decimal point or to indicate that zero is a significant figure." Then the leading zero before the decimal point is retained as this shows the position of the decimal point. The zero between 1 and 2 is a key part of the number. The final zero (after 2) is a significant figure otherwise the number would be written 0.102. Consequently, the 4 significant figures are "1020" but are presented as 0.1020 to ensure the true value of the number is accurately given.
4 significant figures (because this number has a decimal, start counting at the first non-zero digit from the left...so count 2300).
you do not always have to put it there, but some teachers want you to. hope this helped. No. Not unless there is another real (1-9) number to the left of the zero. If, or instance, your number is 0.45 only the 4 and 5 are significant. But, if you have 70.45 then the zero IS significant.
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