GRE Math : How to convert decimals to scientific notation
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Example Questions
Example Question #1 :Decimals
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 #1 :How To Convert Decimals To Scientific Notation
We need to convert
The trick is, however, figuring out what
Therefore, for our value,
问题# 3:例子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
为每一个of the answer choices, this would give us:
When you convert, youaddfor each place that you move to theleftandsubtractfor each place you move to theright. (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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