No, 3sf is basically when you have 3 numbers which are not zero. However, this changes in an example such as 0.109, where this is 3sf, as there is a number above value of zero before a zero, meaning that all the following numbers add to the total of figures.
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It is then 2.64 when rounded to three significant figures
That depends on how many significant figures you are talking about.If three significant figures then 700 is the largest that rounds to 700.If four significant figures are to be rounded to three significant figures then 700.4If five significant figures are to be rounded to three significant figures then 700.49If six significant figures are to be rounded to three significant figures then 700.499etc.
40.82 to three significant figures is 40.8
3.7162 to three significant figures is 3.72
0.33058 to three significant figures is 0.331