In scientific notation all numbers are written in the form of

a X 10^b

(a times ten raised to the power of b), where the exponent b is an integer, and the coefficient a is any real number called the significand or mantissa.

if b < 0 (b is negative integer we have)

and a >=0 then

a x 10^b <= a*10

and a<0

a x 10^b > a

the value of a number in scientific notation with a negative exponent lies

if a >= 0 between 0 and a

if a<0 between a and 0