0.00100
Although the two trailing zeros do not change the value of the number their presence indicates the number of sf.
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There is no such thing as a nearest significant figure. For sf (as with decimal places) it is necessary to specify how many. 0.00747 to 1 sf is 0.007, to 2 sf it is 0.0075, to 3 sf it is 0.00747, to 4 sf it is 0.007470 and so on.
It is: 0.00046
The number cannot be 64 when rounded to 1 sf.
0.002353 rounded to 2 sf is 0.0024
3.27 x 2.35 = 25.128315 Any of those numbers can be rounded to any number of significant figures (SF) both before and after the multiplication. We just need to know how many SF you would like.