This activity was designed to address the comparison portion of MCC8.EE.3. I thought it would be more engaging to compare salaries than sizes of planets. In searching the Internet, I discovered a list of the 400 wealthiest Americans and surprisingly, it did not include athletes or celebrities. This activity has students compare the salaries of billionaires to other billionaires and millionaires. Students practice converting numbers into scientific notation, division of scientific notation, and converting out of scientific notation. I added a writing extension asking kids to research one of the unknown billionaires for extra credit.