Jeri Ferris 
What Are You Figuring Now? [PDF ebook] 
A Story about Benjamin Banneker

In 1791 plans for the new capital city, Washington, DC, were in the works, but someone was needed to help with the surveying. Thomas Jefferson recommended Benjamin Banneker for the job. Banneker was a free black man who lived at a time when black Americans had few, if any, rights. Yet he was an accomplished farmer, mathematician, astronomer, and surveyor. What Are You Figuring Now? is the story of a man who was never afraid to try something new, no matter how difficult.