Mental Addition and Subtraction
Lecture no. 2 from the course: The Secrets of Mental Math
Taught by Professor Arthur T. Benjamin | 31 min | Categories: The Great Courses Plus Online Mathematics Courses
Professor Benjamin demonstrates how easily you can mentally add and subtract one-, two-, and three-digit numbers. He also shows 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.