How do you write 345,000,000,000 in scientific notation?
There are different ways this can be explained. I tend to use this one!
To end up with the most significant number to the left of the decimal point and all the rest to the right of it. This is don by doing the equivalent of keeping the decimal point where it is and then 'sliding' the numbers left or right to achieve this state.
In doing the above we have effectively changed its value. This has to be corrected by making a mathematical adjustment.
Suppose we were given the value of 10.5
Keep the decimal place still and slide the number to the right one space.
So we have
To change this back to the original value multiply by 10 giving:
Which is not the same value until we divide it by 1000
Slide this to the right 11 times giving:
Applying the correction: