Because every science course I’ve taken so far has left me even more confused than ever.
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Really large or small numbers can be very long when written or typed, and it’s a lot easier to read a figure times a power of 10 rather than counting decimal places in many cases.
There also issues of conveying the precision of a measurement. If someone writes out “9,300,000 miles”, it’s not immediately clear if they mean “9.3 million miles”, or “exactly 9.300000 million miles”. Writing the former of the two implies that the measurement may be rounded to the nearest hundred thousand miles.
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