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3.86 x 105 Scientific notation is useful to get rid of seeing the zeros in a number. Count how many places you need to move your decimal place to have the last non zero number in the ones place and the rest of the numbers to the right of the decimal. The number of movements will be the exponent. When you are moving the decimal place to the left your exponent will be positive, when moving the decimal right, your exponent will be negative.

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Q: What is 386 000 km in scientific notation?
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