Question

How do you write 129.5 million in scientific notation?

Answer 1

`1.295 xx 10^8`

Explanation:

Written out it looks like:
`129,500,000`

We're going to move the decimal place to the left to remove all of the zeroes. Right now the decimal place is here:
`129,500,000color(red).`

We're going to move it all the way to here and remove the zeroes:
`1color(red)"."29,500,000 rarr 1color(red)"."295`

Okay, so put your finger where the decimal is at in the first spot and move it all the way to the second spot, counting as you go. You should have moved `"8 places"`. So we're going to use the power of 10 with a 8 as the exponent:

`1.295 xx 10^8`

Here is a helpful image on scientific notation:

And here is a helpful article .