The fifth day Prayers for Navratri is dedicated to Goddess Skanda Mata. Navratri Day 5 Mantra in Hindi is given below. It is chanted on October 18, 2015 during Navratri. There are three mantras. First is Mool Mantra for fifth day of Navratri. Second is Dhyan Shloka dedicated to Goddess Skanda Mata. Third is a Stotra. You can chant also prayers like Lalita Sahasranama on the day.
There is no need to chant all mantras. Most devotees chant just the mool mantra.