Any number that is not zero is significant. However, zeros that appear between non-zeros are significant. Even more confusing is that leading zeros are not significant while trailing zeros are. So, it really depends on what you are looking at. And where the zeros are.
3 significant figures.
If the conversion factor is exact, then the number of significant figures in the answer is the same as the number of significant figures in the original number.If the conversion factor is an approximation, then the number of significant figures in the result is the lesser of this number and the number of significant figures in the original number.
The least number of significant figures in any number of the problem determines the number of significant figures in the answer.
There are 3 significant figures in this number.
There are 4 significant figures in this number.
The answer will usually depend on the number of significant figures in the numbers from which there numbers were derived.
The appropriate number of significant figures to use in expressing the result of 51.6 x 3.1416 is three. This is because the factors each have three significant figures, so the result should also have three significant figures. The answer would be 162.
When adding numbers with significant figures, the result should be rounded to the least number of decimal places in the original numbers. Add the numbers as usual, then round the result to the appropriate number of significant figures.
When adding numbers, the result should be rounded to the same number of decimal places as the number with the fewest decimal places. This ensures that the final answer has the appropriate number of significant figures.
When multiplying numbers with significant figures, count the total number of significant figures in each number being multiplied. The result should have the same number of significant figures as the number with the fewest significant figures. Round the final answer to that number of significant figures.
3 significant figures.
Three significant figures are in this number.
If the conversion factor is exact, then the number of significant figures in the answer is the same as the number of significant figures in the original number.If the conversion factor is an approximation, then the number of significant figures in the result is the lesser of this number and the number of significant figures in the original number.
The least number of significant figures in any number of the problem determines the number of significant figures in the answer.
There are six significant figures in this number (i.e. all the figures here are significant).
There are 3 significant figures in this number.
There are 3 significant figures in this number.