# how to in scientific notation

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• Mar 4th 2007, 12:04 PM
diamond1
how to in scientific notation
how do u do this i dont understand

how do u write that in scientific notation?
8 billion

0.00003125 in scientific notation?
• Mar 4th 2007, 01:03 PM
Jhevon
Quote:

Originally Posted by diamond1
how do u do this i dont understand

how do u write that in scientific notation?
8 billion

0.00003125 in scientific notation?

Scientific notation is when you express a number in the form:

a.*** x 10^n

where a is an integer between 1 and 9 inclusive, .*** means some decimal expansion, the number of decimals may vary based on how many significant figures you want, and "x 10^n", is read "times 10 to the n" and n is some integer that tells you how many times to move the decimal point to the right or left to get the actual number. If n is negative, we move the decimal point to the left, if it is positive, we move it to the right. So here goes.

8 billion = 8,000,000,000 = 8.0 x 10^9

this means we take the number 8.0 and move the decimal point 9 places to the right to get 8 000 000 000, which is 8 billion

0.00003125 = 3.125 x 10^-5
this means we take the number 3.125 and move the decimal point 5 places to the left to get the number 0.00003125

Understand? if anything is unclear, please say so
• Mar 4th 2007, 04:13 PM
ThePerfectHacker
Quote:

Originally Posted by diamond1
how do u write that in scientific notation?
8 billion

8 billion = 8,000,000,000 = 8 X 10^9

Quote:

0.00003125 in scientific notation?
3.125 X 10^{-5}