Give the number of significant figures in the following number? 0.00546

I count 3, all to the rightmost.

http://www.usca.edu/chemistry/genchem/sigfig.htm

To determine the number of significant figures in a number, follow these steps:

1. Start counting from the first non-zero digit.
2. Include all of the digits that come after the first non-zero digit.
3. Also, count any zeros between the first non-zero digit and the decimal point.
4. However, do not count trailing zeros if they come after the decimal point and there are no non-zero digits after them.

Using these guidelines, let's analyze the number 0.00546:

1. Start counting from the first non-zero digit. In this case, it is 5.
2. Include all of the digits that come after the first non-zero digit. In this case, there are three digits (4, 6, and 0) after the first non-zero digit, giving us a total of four digits.
3. Count any zeros between the first non-zero digit and the decimal point. In this case, there are two zeros.
4. However, do not count trailing zeros if they come after the decimal point and there are no non-zero digits after them. Since the zero at the end does not have any non-zero digits after it, it is not significant.

By following these steps, we can determine that the number 0.00546 has four significant figures.