Add from rightmost place value. Regroup when a column totals 10 or more.

Hundredths	=	7 + 4 = 11 hundredths = 1 tenth + 1 hundredth
Tenths	=	0 + 9 + 1 (carry) = 10 tenths = 1 one + 0 tenths
Ones	=	2 + 3 + 1 (carry) = 6
Sum	=	6.01