How do you write $1,287,000,000$ in scientific notation?

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Answer 1 · 2016-05-13T01:48:35

$1,287,000,000=1.287\times10^9$ .

To put a number into scientific notation:

Move the decimal point right or left until one nonzero digit is to the left of the moved decimal point. Call the number with the moved decimal point $a$ .
Count the number of places you moved the decimal point, call it $n$ . If you moved the decimal point to the left, that is a factor of $10^n$ versus the original number. If you moved the decimal point to the right, that is a factor of $10^{-n}$ .
The original number in scientific notation is $a\times10^n$ or $a\times10^{-n}$ depending on which way you used the decimal point.

This for $1,287,000,000$ we get

$a=1.287$

by moving the decimal point nine places ( $n=9$ )

to the left ( $n$ has the positive sign).

Thus $1.287\times10^9$ .

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