Question

Question #dc2ee

Answer 1

`0.2499980` could be written in scientific notation in several ways
`0.02499980 xx 10^1` or
`0.2499980 xx 10^0` or
`2.499980 xx 10^(-1)` or
`24.99980 xx 10^(-2)` etc.

The most common form is normalized scientific notation with a single digit to the left of the decimal point; that is, in this case,
`2.499980 xx 10^(-1)`

On a calculator, this is often displayed as
`2.499980E-1`

Here is a video which summarizes how to write numbers in scientific notation.

video from: Noel Pauller