Khan Academy

Description: Lindsay finds a pattern from multiplying 1-digit numbers by multiples of 10, 100, and 1000. Let's multiply four times 80. We know a pattern for multiplying by 10, so let's try to break up this 80 to get a 10. And then we have this times 10 back here which is super helpful 'cause there's a nice neat pattern in math that we can use to help us with the times 10 part.

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