How do you sum unlike fractions? - Answers

Step 1: Find a common multiple of the two denominators. The least common multiple is preferable, but not an absolute necessity. Step 2a: Take the first fraction and find an equivalent fraction with this common multiple as its denominator. Step 2b: Do the same for the second fraction. Step 3: Add the numerators of these equivalent fraction and this will be the numerator of the sum. The denominator of the sum will be the common multiple. Step 4: Simplify the answer if possible. If you have gone for a common multiple rather than the lowest common multiple, this will always be possible. Step 5: Enjoy. So here is an example: 2/3 + 5/7 Step 1: The two denominators are 3 and 7. LCM(3, 7) = 21 Step 2a: 2/3 = 14/21 Step 2b: 5/7 = 15/21 Step 3: Numerator = 14+15 = 29. Denominator = 21. So answer = 29/21 Step 4: Cannot be simplified. Step 5: Oh, yesss!