It is already in word form as seven tenth or if you mean seven tenths then it is equivalent to 7/10 as a fraction
seven and seven tenths
Three and seven tenths.
seven tenths.
Seven tenths.
One and seven tenths
One and seven tenths.
Seven tenths.
Seven tenths.
Fourteen and seven tenths.
Seven and two tenths.
seven tenths
0.7 in word form is seven tenths.