The use of scientifice notation ensures you that all the zeros shown are significative.
For exampleif you wrire 4.30 * 10^ 5 means that there are 3 significant figures because the 0 counts, and if you wirte 4.300 * 10^5 means that there are 4 significant figures becasue the two zeros count.
So, if you want to state the number of significant figures in 506000 cm, write it in scientific notation with all the zeros: 5.06000 * 10^5 cm
Answer: [tex]5.06000. 10^{5} [/tex]
