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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.

View the full lesson: http://ed.ted.com/lessons/one-is-one-or-is-it

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