To find the smallest decimal, compare place values from left to right: ones, then tenths, then hundredths.

Numbers	=	7.30, 3.07, 7.03, 3.70
Compare ones: 7, 3, 7, 3. 3 is smaller than 7. Between 3.07 and 3.70, compare tenths: 0 < 7. So 3.07 is the smallest.
Smallest	=	3.07