Question

How do you write `20,000,000` in scientific notation?

Answer 1

`20,000,000 = color(green)(2.0xx10^7)`

Explanation:

Except for the value `0.0`
scientific notation is always written in the form of
`color(white)("XXX")color(red)("mantissa")xx10^color(blue)("exponent")`

where `color(red)("matissa")` is written as a single non-zero digit followed by a decimal point and an extended decimal fraction (by tradition at least one digit in the "extended decimal fraction").

and the `color(blue)("exponent")` is the power of `10` needed to raise the mantissa to the original value.

`20,000,000 = 2.0 xx 10,000,000 = color(red)(2.0) xx10^color(blue)(7)`