How many significant figures in 2.308?
2.308 has 4 significant figures.
Significant figures
Non-zero digit. Every non-zero digit is significant.Zero between digits. A zero between two non-zero digits is significant.Leading zero. Leading zeros only fix the decimal point, so they are not significant.Trailing zero after the point. Trailing zeros in a number with a decimal point are significant.Trailing zero, no point. Trailing zeros in a number without a decimal point are not counted. Write 1.00 × 10² to make them count.Digit of a in a × 10ⁿ. In a × 10ⁿ every digit of a is significant, including its zeros. Counted and defined numbers, such as 3 coins or 100 cm in a metre, are exact and have unlimited significant figures.
Tap a digit to see why it counts.
4significant figures
Scientific notation2.308 × 100
Round to
2.308→2.308
Nothing is dropped.
Add, subtract, multiply, divide
Add or subtract. The answer keeps as many decimal places as the number that has the fewest. Multiply or divide. The answer keeps as many significant figures as the number that has the fewest. The rounding is done once, on the exact result.
- 4.2374 significant figures
- 2.513 significant figures
Exact result1.68804780876
Multiply or divide: keep the fewest significant figures.
Reported1.693 significant figures
Digit by digit
- 238
Non-zero digit: countsEvery non-zero digit is significant.
- 0
Zero between digits: countsA zero between two non-zero digits is significant.
2.308 × 10⁰
- Rounded to 2 significant figures2.3
- Rounded to 3 significant figures2.31
Nearby numbers
Rounding a value? See 2.745 to 3 significant figures.
2.308: quick answers
How many significant figures does 2.308 have?
2.308 has 4 significant figures. In 2.308, zeros between non-zero digits count.
Why do the zeros inside 2.308 count?
A zero between two non-zero digits is significant, because it is a measured digit with a value, not a place holder.
What is 2.308 rounded to 3 significant figures?
2.308 rounded to 3 significant figures is 2.31. The dropped part 8 is more than half, so the last kept digit 0 goes up by one.