This old radio uses a pentode.

He was drawing a pentadecagon shape.

My room is twenty-five square meters.

My father is thirty-five years old.

My grandfather retired at the age of fifty-six.

This old house was built fifty-six years ago.

Gojuroku always encourages everyone with a smile.

Pentathlon is a competition that tests both physical strength and technique.

Every fifteenth day of the month, our family goes to the temple.

I work five days a week.