 Working side jobs is on the rise for Americans looking to earn some money beyond their main source of income. The Bankrate survey finds that 36% of U.S. adults earn extra money through a side hustle. We find people side hustling for crafts and child care and landscaping and home repair, pet sitting, dog walking, freelance writing, graphic design. Bankrate senior analyst Ted Rossman says some take on these gigs to develop a hobby or fill their free time.