Question

convert 0.045 to scientific notation

Answer 1

0.045
=4.5×10−2
4.5 is called the initial number or coefficient.
EXPLANATION
Move the decimal until you have the smallest whole number you can get.
What ever direction you move the decimal will tell you if it is a positive or negative exponent. In this case it was less than 1, therefore it will be a negative exponent. 
Had the number been greater than one, it would've been a positive exponent.

Answer 2

Heya,

0.045

=> 4.5×10^2

Hope my answer helps you :)

Regards,
Shobana