How do I handle scientific notation when applying sig fig rules and calculating percent error?

Scientific notation maintains the number of sig figs. For example, 2.50 x 10^3 has three sig figs. When performing calculations, follow the standard sig fig rules based on the number of sig figs in each number, regardless of whether they are expressed in standard or scientific notation. The final answer should be expressed in scientific notation with the correct number of sig figs and appropriate exponent.