12
forty three and six tenths
Forty-two and three tenths
43.2
It's forty three sixtyiths
43.8
Forty three and nine tenths.
41.3 = forty-one and three 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.
43.9
41.3 = forty one and three tenths.
448.3