She ate one-seventh of the cake.

The class has eighty-sevenths of the students attending the field trip.

There are fifty-sevenths of the total population who are under the age of 18.

There are forty-sevenths in the deck of cards.

The ninety-sevenths in the crowd cheered loudly.

The seventy-eighths are celebrating their anniversary today.

I have attended seventy-sevenths of my friend's birthday parties.

The seventy-ninths are celebrating their anniversary today.

There are seventy-seconds in a minute.

There are seventy-eights in the deck of cards.