ScientificNotation Helppppp

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- anonymous

ScientificNotation Helppppp

- jamiebookeater

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- anonymous

|dw:1352247570190:dw|

- anonymous

and that would equal 9.944 x 10to the negative 6 power right???

- phi

what is 1.08 * 9.3 ?

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## More answers

- anonymous

9944

- phi

are you doing the multiplication by hand?

- anonymous

cyes

- phi

When you get time, this might help
http://www.khanacademy.org/math/arithmetic/decimals/v/mulitplication-8--multiplying-decimals--old-video
but 1.08 * 9.3 is not 9.944

- anonymous

ok wait let me retry this

- anonymous

ok i to 10.044 x 10 to the -6 but the real answer is 1.0044 x10 to the -5...

- phi

10.044 x 10^-6
that is correct. but you want it in "standard" form. 10 is too big
so divide 10.044 by 10 (make it smaller)
to compensate, make 10^-6 bigger by 10 (multiply by 10 which means add 1 to its exponent)

- anonymous

so you have to add one or am i correct?

- phi

Did what I wrote not make sense?
think about this:
you have
10.044 x 10^-6
we can multiply by 10/10 (ten divided by 10 is just 1)
10.044/10 x 10 x 10^-6
10.044/10 is 1.0044
10^1 x 10^-6 is 10^(1-6) or 10^-5
so the final answer is
1.0044 x 10^-5

- anonymous

so you can't have a number less than 1 or greater than 10???

- phi

you could, but it would not be in "standard form"
if you had
0.001
you would multiply by 1000 (or just count 1,2,3 how many spots you move the decimal point). then you would compensate by multiplying by 10^-3
1.000 x 10^-3

- anonymous

ok i new that i am just learning that .0001..you would go to the right 4 times and you would get 1 x 10 to the -3

- phi

you mean 0.0001 is 1 x 10^-4

- anonymous

ooo

- phi

0.0001 x 10000 /10000 or with exponents
0.0001 x 10^4 * 10^-4
(0.0001 x 10^4) * 10^-4
(0.0001 x 10000) * 10^-4
1.0 * 10^-4

- anonymous

ok got it

- phi

good. otherwise you won't understand the national debt, which needs scientific notation...

- anonymous

yup! thxx

- anonymous

ooo haha i just realize that 0 is bigger than -1 so when you have to compensate you would just add 1 that also goes with positive exponents right?

- phi

yes, 0 is bigger than -1. but 0 is neither positive nor negative. and of course 10^0 is the same as 1, so people generally don't use scientific notation when the exponent is 0
who would want to write 2 x 10^0 when 2 is all you have to write?

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