Notice how the power (exponent) on the 10 is the same as the number of 0’s in the power of 10 (in the number to the left of the parentheses). For example, the exponent in 10^4 is 4, and there are four 0’s in 10,000. The key thing to remember then is that, when we multiply a number by a power of 10, all we do is count the 0’s in the power of 10 and then move the decimal point that many places to the right in the other number, and that gives us the product.

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