One is one ... or is it? - Christopher Danielson
View full lesson on TED-Ed BETA: http://ed.ted.com/lessons/one-is-one-or-is-it
One bag of apples, one apple, one slice of apple -- which of these is one unit? Explore the basic unit of math (explained by a trip to the grocery store!) and discover the many meanings of one.
Lesson by Christopher Danielson, animation by TED-Ed.