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 August 29th, 2017, 10:52 AM #1 Senior Member   Joined: Aug 2014 From: Mars Posts: 101 Thanks: 9 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?
 August 29th, 2017, 11:02 AM #2 Senior Member     Joined: Sep 2015 From: USA Posts: 1,696 Thanks: 861 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.
August 29th, 2017, 01:21 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, 03:47 AM #4 Senior Member   Joined: Aug 2014 From: Mars Posts: 101 Thanks: 9 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?
 September 1st, 2017, 04:00 AM #5 Math Team     Joined: Jul 2013 From: काठमाडौं, नेपाल Posts: 876 Thanks: 60 Math Focus: सामान्य गणित It's used in calculators also. Last edited by skipjack; September 1st, 2017 at 05:33 AM.
 September 1st, 2017, 06:03 AM #6 Global Moderator     Joined: Oct 2008 From: London, Ontario, Canada - The Forest City Posts: 7,697 Thanks: 977 Math Focus: Elementary mathematics and beyond 2.155237795E11 is actually 2.155237795 x 10$^{11}$.
September 1st, 2017, 07:18 AM   #7
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Quote:
 Originally Posted by Opposite 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).

September 1st, 2017, 07:35 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.

September 3rd, 2017, 03:38 PM   #9
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Quote:
 Originally Posted by romsek 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

 September 5th, 2017, 12:14 PM #10 Math Team   Joined: Jan 2015 From: Alabama Posts: 2,922 Thanks: 785 Of course we Martians use base 12 so "E10" would be $\displaystyle 12^{10}$.

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