Just leave them alone because they are already in 4 significant figures.
Five Additional answer You should put a decimal point in the figures.
4 significant figures.
6.871 x 10^4
The number 20 can be expressed in significant figures depending on how precise you want it to be. If it is written as "20," it has one significant figure. If you want to indicate that both digits are significant, you can write it as "20." or "2.0 x 10^1," which shows two significant figures. The use of a decimal point or scientific notation clarifies the number of significant figures intended.
There are 4 significant figures in 0.0032. Seems to be only 2 significant figures in this number.
There are 3 significant figures in 94.2.
In the number 0.05, there are two significant figures. The zero before the decimal point is not considered significant as it is a leading zero. The significant figures in a number are the digits that carry meaning contributing to its precision.
5 significant figures.
There are four significant figures in 0.1111.
4 significant figures.
3 significant figures.
3 significant figures.