Electrical mathQuestion 628 of 1506

How many significant digits does the number 3,005 have?

  1. One, because all of the other digits are rounded off
  2. Four, because the two zeros are not just placeholders
  3. Two, because only the first two digits are counted
  4. Three, because zeros are never counted as significant digits
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Correct answer: Four, because the two zeros are not just placeholders

The zeros between non-zero digits show the figure is accurate to the nearest unit.

Source: Lessons in Electric Circuits I: DC (Kuphaldt), 4.1: Scientific Notation

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Questions last reviewed: 18 October 2026