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6.87 x 10^-5 : The decimal place must be moved so that the number is between 1 and 10 {it can equal 1, but not 10, though}. Five places moved makes it 6.87, now we moved it 5 places to the right, so the power is 5, but to the right means negative power. So the power of ten is -5.

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12y ago
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Q: What is 0.0000687 written in scientific notation?
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