To find a number to two significant figures or any amount of significant figures you look at one plus the amount of asked figures, in this case the third significant figure, and if it is 5 or greater increase the asked amount of significant figures by one. If it is 4 or less make no changes to your number. Finally report the calculated number with the asked amount of significant figures.
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42 has two significant figures.
687 to two significant figures is 690.
23.43 rounded to two significant figures is 23.
Rounded to two significant figures it becomes 1.0e4
Rounded to two significant figures it becomes 3.6