In this video, "Mathemagician" Arthur Benjamin demonstrates how to easily add and subtract one-, two-, and three-digit numbers in your head. He also teaches you shortcuts using the complement of a number (its distance from 100 or 1000) and demonstrates the uses of mental addition and subtraction for quickly counting calories and making change. If you like this video on mental math, check out all the other videos in our "Mental Math" playlist. 0:00 Intro 0:41 Adding One-Digit Numbers 1:40 Adding Two-Digit Numbers 5:10 Adding Three-Digit Numbers 11:20 Subtracting Two-Digit Numbers 14:50 Subtracting Three-Digit Numbers 18:23 Using Compliment Numbers 23:20 Using Three-Digit Compliment Numbers 25:00 Using Compliment Numbers to Make Change 28:43 Summary and Recap Presented by Arthur Benjamin Learn more about addition and subtraction at www.wondrium.com/youtube ------------------------------------------- The Great Courses is the global leader in lifelong learning and our video-on-demand service The Great Courses Plus gives you unlimited, uninterrupted access to a world of learning anytime and anywhere you want it. With courses on thousands of topics, you are sure to find something that will ignite your curiosity and invigorate your passion for learning. Enjoy a curated sampling of our full catalog of content by subscribing to our YouTube channel. We add new history, science, and math videos every week. ------------------------------------------- Read articles from the smartest experts in their fields: www.Thegreatcoursesdaily.com Find us on all our social channels: -Facebook: www.facebook.com/wondrium -Twitter: twitter.com/wondrium -Instagram: www.instagram.com/wondrium ------------------------------------------- #MathTricks #Mathemagic #ArthurBenjamin

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