Ah, seven tenths in word form is simply seven over ten. Imagine it like a little group of seven friends out of a total of ten, happily holding hands together. Just a lovely way to represent a fraction, isn't it?
Seven tenths in word form is "seven tenths." This means that you have a fraction where the numerator is 7 and the denominator is 10. In decimal form, this would be written as 0.7.