Question

Which number is NOT a scientific notation
11x 10^21
5.7x10^9
3.1x 10^-12
1.67x10-5

Answer 1

Any ideas?

Answer 2

Let's recall the rule for scientific notation:

Scientific notation is a standard way of writing very large and very small numbers so that they're easier to both compare and use in computations. To write in scientific notation, follow the form
\[N \times10^a\]
where N is a number between 1 and 10, but not 10 itself, and a is an integer (positive or negative number).

Answer 3

The first one 11x10^21

Answer 4

Why do you think it is the first one?

Answer 5

Because 21 is to large to be a exponent

Answer 6

Right answer, wrong reason.

Answer 7

11 is not less than 10 is the correct reason.