GRE Math : Other Decimals
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Example Questions
Example Question #1 : How To Convert Decimals To Scientific Notation
Write 
We want to move the decimal point to the place just after the first non-zero number, in this case 6, and then drop all of the non-significant zeros. We need to move the decimal point five spaces to the right, so our exponent should be negative. If the decimal had moved left, we would have had a positive exponent.
In this case we get 6.009 * 10–5.
Example Question #2 : How To Convert Decimals To Scientific Notation
We need to convert 
The trick is, however, figuring out what 
Therefore, for our value, 
Example Question #2 : How To Convert Decimals To Scientific Notation
The easiest way to do this is to convert each of your answer choices into scientific notion and compare it to 
For each of the answer choices, this would give us:
When you convert, you add for each place that you move to the left and subtract for each place you move to the right. (Note that this is opposite of what you do when you multiply out the answer. We are thinking in "reverse" because we are converting.)
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