Oh honey, it's not rocket science. You write 1.4 as "one point four." The "one" represents the whole number, and the "four" represents the tenths place. Just remember to enunciate clearly so nobody thinks you're saying "one point for" instead.
14 tenths =1.4
14.7 or fourteen and seven tenths
14 4/10
1.4
Nine tenths.
0.5 = five tenths.
4.7 = Four and seven tenths.
Four and five tenths.
Five tenths.
Four tenths.
Seven tenths.
Eight tenths.