Question

How do you write `0.000 40` in scientific notation?

Answer 1

`4*10^-4`

Explanation:

`4*10^-4`
`4*1/10000`
`4/10000`
`0.0004=0.00040`

Answer 2

The decimal point needs to be moved 4 places to the right so the exponent for the 10s term will be negative:

`0.00040 = 4.0 xx 10^-4`