12
forty three and six tenths
Forty-two and three tenths
43.2
It's forty three sixtyiths
41.3 = forty-one and three tenths.
43.8
Forty three and nine tenths.
Forty and three tenths or forty dollars and thirty cents.
You cannot. Forty tenths is, in fact, equal to 4. So the answer is 3 + 4 = 7 which is an integer, not a fraction.
41.3 = forty one and three tenths.
43.9
448.3