Question

How do you write 0.00643 in scientific notation?

Answer 1

`0.00643` in scientific notation is `6.43xx10^(-3)`

Explanation:

In scientific notation a number is written as `axx10^n`, where `n` is an integer and `a` is a number which has just one digit to the left of decimal i.e. `1<=a<10`.

Hence to write `0.00643` in scientific notation, we will have to move decimal three places to the right.

Hence `0.00643` in scientific notation is `6.43xx10^(-3)`

Answer 2

`6.43*10^5`

Explanation:

The key realization is that when we write numbers in scientific notation, we want one digit before the decimal point.

In our case, we must loop it `5` times to the left. The number of times we loop it is the exponent, and looping left makes it positive. Thus, we have

`6.43*10^5`

Hope this helps!