To determine the number of significant figures in 0.00200, we apply the standard rules:

Significant Figures Rules Applied

• Rule 1: Non-zero digits are always significant. The digit '2' is significant.
• Rule 2: Leading zeros (zeros before the first non-zero digit) are not significant. The zeros in '0.00' are leading zeros and thus not significant.
• Rule 3: Trailing zeros (zeros at the end of a number) are significant only if the number contains a decimal point. Since 0.00200 contains a decimal point, the two trailing zeros after the '2' are significant.

Counting Significant Digits

Based on these rules:

• The leading zeros (0.00) are not significant.
• The digit '2' is significant.
• The trailing zeros (00) are significant because a decimal point is present.

Therefore, the significant digits are 2, 0, and 0.

Final Count

The total number of significant figures in 0.00200 is 3.