Round 0.002346 to 3 significant figures.

0.00235

Explanation:

Zeros that come before any non-zero digits are never significant.Zeros that are in between any non-zero digits are always significant.Zeros that come after any non-zero digit are ONLY significant if a decimal point in present somewhere in the number. (In this case there is a decimal point, but there aren't any zeros at the end of this number.)

The zeros at the beginning aren't significant, so include those zeros in your answer. The 6 at the end in greater than 5 so that rounds the 4 to up one number (In this case, it's 5).

This gives you 0.00235

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