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Little known fact: Abraham Lincoln was a very good math student! In this video I share the story of why he studied Euclid's Elements. I also share a problem he did while in school. He did in fact get the correct answer, and we can deduce the steps he took from the somewhat mysterious calculations in his manuscript. My blog post for this video: https://wp.me/p6aMk-5s0 Presidents' Day Special. Math Homework of George Washington And Abraham Lincoln: https://youtu.be/bUkLjsRXi44 Sources and further reading Henry Ketcham, The Life of Abraham Lincoln, at Project Gutenberg. http://www.gutenberg.org/cache/epub/6811/pg6811-images.html Harvard University - Hougton Library / Lincoln, Abraham, 1809-1865. Exercise book fragment: manuscript, [ca. 1825]. MS Am 1326. Houghton Library, Harvard University, Cambridge, Mass. https://blogs.harvard.edu/houghton/2013/06/10/adding-a-page-to-lincolns-oldest-manuscript/ http://archive.boston.com/yourcampus/news/harvard/2013/06/professors_piece_together_manuscript_of_abraham_lincolns_math_homework.html http://nautil.us/issue/41/selection/euclid-as-founding-father http://www.independent.co.uk/news/world/americas/abe-lincolns-maths-homework-found-in-harvard-university-archives-8650776.html https://www.illustrativemathematics.org/content-standards/tasks/1550 https://www.mathopenref.com/euclid.html If you like my videos, you can support me at Patreon: https://www.patreon.com/mindyourdecisions Connect on social media. I update each site when I have a new video or blog post, so you can follow me on whichever method is most convenient for you. My Blog: https://mindyourdecisions.com/blog/ Twitter: https://twitter.com/preshtalwalkar Facebook: https://www.facebook.com/pages/Mind-Your-Decisions/168446714965 Google+: https://plus.google.com/108336608566588374147/posts Pinterest: https://www.pinterest.com/preshtalwalkar/ Tumblr: https://preshtalwalkar.tumblr.com/ Instagram: https://instagram.com/preshtalwalkar/ Patreon: https://www.patreon.com/mindyourdecisions Newsletter (sent only for big news, like a new book release): http://eepurl.com/KvS0r If you buy from the links below I may receive a commission for sales. This has no effect on the price for you. My Books "The Joy of Game Theory" shows how you can use math to out-think your competition. (rated 3.8/5 stars on 31 reviews) http://amzn.to/1uQvA20 "The Irrationality Illusion: How To Make Smart Decisions And Overcome Bias" is a handbook that explains the many ways we are biased about decision-making and offers techniques to make smart decisions. (rated 4.6/5 stars on 3 reviews) http://amzn.to/1o3FaAg "Math Puzzles Volume 1" features classic brain teasers and riddles with complete solutions for problems in counting, geometry, probability, and game theory. Volume 1 is rated 4.4/5 stars on 13 reviews. http://amzn.to/1GhUUSH "Math Puzzles Volume 2" is a sequel book with more great problems. (rated 4.3/5 stars on 4 reviews) http://amzn.to/1NKbyCs "Math Puzzles Volume 3" is the third in the series. (rated 3.8/5 stars on 5 reviews) http://amzn.to/1NKbGlp "40 Paradoxes in Logic, Probability, and Game Theory" contains thought-provoking and counter-intuitive results. (rated 4.3/5 stars on 12 reviews) http://amzn.to/1LOCI4U "The Best Mental Math Tricks" teaches how you can look like a math genius by solving problems in your head (rated 4.7/5 stars on 4 reviews) http://amzn.to/18maAdo "Multiply Numbers By Drawing Lines" This book is a reference guide for my video that has over 1 million views on a geometric method to multiply numbers. (rated 5/5 stars on 3 reviews) http://amzn.to/XRm7M4

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