Priyanka G is a student at Millath College of Teacher Education in Sooranadu, Kollam, Kerala, India. Her optional subject is mathematics. The document defines different number types including whole numbers, natural numbers, integers, fractions, and rational numbers. It notes that natural numbers, their negatives, and zero are collectively known as integers. It also states that integers and fractions together are called rational numbers, and any rational number can be written as x/y where x and y are integers.