Significant numbers by definition do not include leading or trailing zeros which merely serve to show the scale of a number. Thus 83,000 and 83,000,000 and 830 all have the same number of significant numbers, 2. The two significant numbers are 8 and 3.
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Clarification: Trailing 0s AFTER the decimal point DO count unless they are there purely for conventional reasons (for example, two decimal places in most currencies). Such trailing 0s are indications of the precision of the number.
So, for example, 0.83 has 2 significant figures but 0.830 and 8.30 have 3 while 8.300 or 0.00008300 have 4.
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4
7.107 has four significant figures.
There are five.
There are three significant figures: the trailing zeros are significant because they are indicative of the precision of the number.
Because 10.00400 is 10.004, this has five significant digits (numbers).