Mathematics - Fractions - Adding and subtracting fractions with unlike denominators - Finding Common Denominators

7 steps: (1) Problem: 2/3 + 1/4. Different denominators! (2) Find the LCD (Least Common Denominator): multiples of 3: 3,6,9,12... multiples of 4: 4,8,12... LCD=12. (3) Convert: 2/3 = 8/12 (multiply by 4/4). (4) Convert: 1/4 = 3/12 (multiply by 3/3). (5) Now add: 8/12 + 3/12 = 11/12. (6) For subtract