One is one ... or could it be?

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. View the full lesson: http://ed.ted.com/lessons/one-is-one-or-is-it Learn more about your ad choices. Visit megaphone.fm/adchoices