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August 29th, 2017, 09:52 AM   #1
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Scientific notation?

I was told that the answer, 2.58998811E10 is in scientific notation. But when I looked at three different explanations, I saw no "E" listed. What does that E mean, and what is this answer expanded out?

What do I type into a search engine to find tutorials?
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August 29th, 2017, 10:02 AM   #2
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E10 is the same as $\times 10^{10}$

so

$2.58998811\text E10 = 2.58998811 \times 10^{10}$

at least that's how we do it here on Earth.
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August 29th, 2017, 12:21 PM   #3
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You don't need a search engine.

The E notation comes from computing and was developed so that you could type in a number without superscript (powers).

This was originally used in programming languages but then introduced into things like spreadsheets.

Try typing 25E10 into a cell in Excel and see what happens.

Then chose 'format cells' and play with the option box.
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September 1st, 2017, 02:47 AM   #4
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So I have a teacher who lists all the answers as fractions and I'm not sure how to do the conversions. I input the fractions into the calculator, but none of them come back with the power. But this is confusing because............

2.155237795E11 is not a large number.... because 2.16^11=4775.197 ... Why not just round?
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September 1st, 2017, 03:00 AM   #5
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It's used in calculators also.

Last edited by skipjack; September 1st, 2017 at 04:33 AM.
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September 1st, 2017, 05:03 AM   #6
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2.155237795E11 is actually 2.155237795 x 10$^{11}$.
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September 1st, 2017, 06:18 AM   #7
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Quote:
Originally Posted by Opposite View Post
I was told that the answer, 2.58998811E10 is in scientific notation.
It's scientific e-notation using E (in the old days, computers charged more for printing in lower case). Scientific notation would be more like 6.276805×10²¹ (which those mean old computers couldn't print at all).
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September 1st, 2017, 06:35 AM   #8
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Quote:
2.155237795E11 is not a large number.... because 2.16^11=4775.197 ... Why not just round?
In case there is any confusion

2.155237795E11 is not $\displaystyle {\left( {{\rm{2}}{\rm{.155237795E11}}} \right)^{11}}$

it is 215,523,779,500

Please say if you do not understand this, it is very important.
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September 3rd, 2017, 02:38 PM   #9
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Quote:
Originally Posted by romsek View Post
E10 is the same as $\times 10^{10}$

so

$2.58998811\text E10 = 2.58998811 \times 10^{10}$

at least that's how we do it here on Earth.
That earth comment was hilarious
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September 5th, 2017, 11:14 AM   #10
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Of course we Martians use base 12 so "E10" would be $\displaystyle 12^{10}$.
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