A Comprehensive Cheat Sheet for Fractions - thoughtco However, when subtracting fractions without the same denominator, a common denominator needs to be found prior to subtracting the fraction. Let's try one: 1/2 - 1/6 (the lowest common denominator is 6) 3/6 - 1/6 = 2/6 which can be reduced to 1/3. There are times when you'll simplify the fractions Reduce Fractions with hints Math Worksheets|Printables PDF Reduce Fractions with hints Math Worksheets. Learn to reduce fractions and practice with these free math worksheets on reducing fractions with hints provided with them. Fractions - Reduce Fraction with Hint 1. Print Worksheet. Fractions - Reduce Fraction with Hint 2. Print Worksheet.