Significant Figures Practice
What Are Significant Figures?
The graphic below demonstrates significant figures. The first significant figure is 1 and the 3rd significant figure is zero. The 5th significant figure is also zero. After the decimal point the next number is also known as tenth. For the number 1508.06, rounding to the nearest 5th significant figure would give the same answer as rounding to the nearest tenth or the first decimal place.
The graphic below shows the answers when 3208, 5.75 and 0.5285 are rounded to 1 significant figure, 2 significant figures and 3 significant figures respectively.
Rounding to Significant Figures
The image below shows the number 0.01704. When the number starts with zero then the zero is not significant. When rounding the number 0.01704 to the first significant figure we ignore the zeros. The answer is 0.02, because 7, which is the next number, is greater than 5.
The image below shows the answers when 3875, 6.254 and 0.07109 are rounded to 1 significant figure and 2 significant figures.