A numerator and denominator is part of a fraction. In the fraction, the top number is the numerator and the bottom one is the denominator. For ex: 5/25, the 5 is the numerator and the 25 is the denominator. And if you're trying to find out how many times 5 goes into 25 just divide the denominator(25) by the numerator(5) and you'll get the answer which of course will be 5.