How many significant figures are in 0.00230?

Three significant figures.

Think of significant figures like the important digits that tell us how precise a measurement is. In the number zero point zero zero two three zero, the zeros before the first nonzero digit are just placeholders and do not count, but every digit from the first nonzero onward does, including zeros at the end if they come after the decimal point. So the two, the three, and the final zero are all meaningful because they show the measurement was precise enough to record that last zero. That trailing zero after the decimal is counted because it tells us the value was measured to that exact place and not rounded off.

A common mistake is counting the leading zeros as significant, which makes the number seem more precise than it really is, and the quick fix is to ignore any zeros before the first nonzero digit when you count significant figures. Another mistake is thinking every trailing zero counts even when there is no decimal point, and the simple way to avoid that error is to check for a decimal point: only trailing zeros after a decimal are definitely significant unless scientific notation says otherwise. Students also sometimes forget that zeros between nonzero digits always count, so remember that zeros sandwiched between other digits are significant because they lie within the measured precision.

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Significant Figures in 0.00230

1. Ignore leading zeros
2. Count from first nonzero digit
3. Include trailing zero after decimal
4. Trailing zeros show measurement precision
5. Do not count placeholders before decimals

Common Mistakes with Significant Figures

1. Counting leading zeros as significant
2. Counting trailing zeros without decimal point
3. Forgetting zeros between nonzero digits count

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