How Do Sig Figs Work with Scientific Notation

There are three rules on determining how many significant figures are in a number: Non-zero digits are always significant. Any zeros between two significant digits are significant. A final zero or trailing zeros in the decimal portion ONLY are significant.

Does scientific notation affect sig figs?

Five rules govern significant figures: … Zeros after the decimal point and after figures are significant; in the number 0.2540, the 2, 4, 5 and last 0 are significant. Exponential digits in scientific notation are not significant; 1.12×106 has three significant digits, 1, 1, and 2.

Do you round when using scientific notation?

Round a number to a quantity of significant figures that you provide. Enter whole numbers, real numbers, scientific notation or e notation. Example inputs are, 3500, 35.0056, 3.5 x 10^3 and 3.5e3.