It need not be.
Mathematically, the number of significant numbers should depend only on the number of significant digits in the measures for mass and volume used to calculate the density.
In real life, though, few substances are identical from one sample to another: their density can vary and a 2 sig fig density is usually the best compromise between accuracy and inclusion of all varieties of the substance.
The number 27000000 expressed using 1 significant figure is 3 x 10^7.
320
4.0 x 10-2 * 8.1 x 102 = 32.4 2 significant digits, so the answer is 32.
To express 0.0728 to two significant figures, you focus on the first two non-zero digits, which are 7 and 2. This rounds the number to 0.073. Therefore, 0.0728 rounded to two significant figures is 0.073.
If your number is "n", you simply divide 2 by the number: 2/n.
There are 2 significant figures in this number.
Two - all nonzero numbers are significant.
2 significant figures.
The number 6.300 has four significant digits. We must assume that the only reason for including the two zeroes at the end is to express the precision of the measurement (whatever it was that was measured to yield this number). If you were only confident about the first two numbers, you would express it as 6.3 rather than 6.300 as you did.
4 significant figures in 4400. A digit within a number is considered significant if: 1. it is a non-zero OR 2. It is a zero that is between two significant figures OR 3. It is a zero at the end of the number To express four thousand four hundred with two significant figures use scientific notation: 4.4 * 103
2 significant figures.
Significant Figures: 2