Question

Which number is not in scientific notation?

0.023 × 10-5

one point eight five times ten to the negative ninetieth

three point seven five times ten to the seventeenth

nine point nine nine times ten to the thirteenth

Answer 1

first is not in the scientific notation

Answer 2

it should be 2.3 times 10^(-7)

Answer 3

Scientific notation is of the form: \[\Large A \times 10^B\]
where A should be between 1 and 10. That is: 1 <= A < B.

If A is not between 1 and 10 then it is not in scientific notation.

Answer 4

it should be 1 <= A < 10 above.