Khan Academy

Description: Lindsay finds a pattern from multiplying 1-digit numbers by 10, 100, and 1000. So let's start here with something like four times 10, one that maybe we're comfortable with or already know. And four tens, one way we could represent that is a 10 plus a second 10 plus a third 10 plus a fourth 10. When we multiply four times 10, we keep our whole number of four and we add a zero to the end for the times 10.

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