Indicate the number of significant digits in the following number.

The number 3,001 has significant digits.

The number 3,001 has four significant digits. This is because all non-zero digits are always counted as significant, and any zeroes between them also count. In this case, the digit ‘3’ and the three digits ‘001’ together make a total of four significant digits.

For numbers like 3,001, trailing zeros after a decimal point are significant, but since this number is a whole number, those rules don’t apply. So we can confidently say: 3,001 has four significant digits!