Multiplying 10s (Full video)

Khan Academy

Supporting grades: 4

Description: Lindsay multiplies multiples of 10 by other multiples of 10, such as 30x50. Let's multiply 40 times 70. So we could actually list that out, the number 70, 40 different times and add it up. For me, multiplying by 10 is the easiest number, because I know the pattern to add a zero.

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