FAN AND MEDAL
Which number is not in scientific notation?
9 ⋅ 1019
7.8 ⋅ 106
1.45 ⋅ 10−7
0.33 ⋅ 10−15

Question

FAN AND MEDAL 
Which number is not in scientific notation?
9 ⋅ 1019
7.8 ⋅ 106
1.45 ⋅ 10−7
0.33 ⋅ 10−15

tkhunny · Answer

What are the rules for "Scientific Notation"?

ivysleague · Answer

has someone answered your question?

anonymous · Answer

The exponent in scientific notation is equal to the number of times the decimal point must be moved to produce a number between 1 and 10?

tkhunny · Answer

Are any of those numbers NOT between 1 and 10?

anonymous · Answer

do i have to work each one out first?

tkhunny · Answer

NO, you just look at the decimal portion (ignore the exponents).

9 - Yup.  That's between 1 and 10
7.8 - Yup.  That's between 1 and 10

Keep going.

anonymous · Answer

1.45, yes? 
0.33, no?