A simple video showing how to subtract fractions with common denominators. The denominators is the bottom number of a fraction and the numerator is the top number. So in the fraction of one half 1 is the numerator and 2 is the denominator. If you have fractions with same denominator you can subtract the numerators to find the difference. After the subtracting the numerators add the common denominator to complete the fraction. So five sevenths subtracted by one seventh equals four sevenths. If the fraction cannot be reduced then the problem is complete.