Question

Which number is NOT in scientific notation?

3.4 × 10^-1

0.4 × 10^5

1.98 × 10^-20

8 × 10^12

Answer 1

D for sure

Answer 2

0.4x10^5

Answer 3

For a number to be in scientific notation the numerical value or the magnitude should always be:

\[1 \le a < 10\]

So, here since, in option 'B', if you see the magnitude part is 0.4, it is not in scientific notation.

Option B in scientific notation is: \[4 ~~. ~~ 10^4\]

Getting this? :)

Answer 4

doesnt a scientific notation always need a coefficient with a decimal after it

Answer 5

so in this case it is asking for which is not......wouldnt that be D

Answer 6

@@driftracer305 and @cutepochacco thanx so much && @AkashdeepDeb I have no idea what u are talking about

Answer 7

@driftracer305

Answer 8

your welcome

Answer 9

Let us say we have number:

Let us say the distance between the sun and the moon = 147 million kilometers

https://www.google.ae/webhp?sourceid=chrome-instant&rlz=1C5CHFA_enAE575AE575&ion=1&espv=2&es_th=1&ie=UTF-8#q=distance%20between%20the%20sun%20and%20moon

Now 147 million kilometers is 147,000,000 kilometers.

Now how do we write this in scientific notation?

We write it like \(1.47 * 10^{8}\) kilometers.

But why do we that?

Because when we multiply 1.47 with 10, 8 times we get 147 million.

You may ask, but why only 1.47 ? Well, that's the convention!

The magnitude part [the number value part] should always be equal to or between 1 and 10.

We couldn't have written it as 14.7 * 10^7 because 14.7 is GREATER than 10, which defies the scientific notation!

Getting this? :)