Adding Mixed Numbers
Date: 12/10/95 at 11:57:56 From: Anonymous Subject: Fractions 3 1/4 + 5 3/12 I've been trying this over and over again and I still don't get it! Please help.
Date: 12/11/95 at 11:45:59 From: Doctor Ken Subject: Re: Fractions Hello! There are a couple of different ways you could approach this problem. You could either convert the mixed numerals to improper fractions and then add, or you could add the parts separately. Here's what I mean when I say you could add the parts separately. Ask yourself "what does 3 1/4 mean?" It means 3 + 1/4. Similarly, 5 3/12 means 5 + 3/12. So 3 1/4 + 5 3/12 just means 3 + 1/4 + 5 + 3/12. So that's four numbers that we can add together. I think it's easiest to add the 3 and the 5 together, and then add the 1/4 and the 3/12 together. Now 3 + 5 = 8, and what is 1/4 + 3/12? Hint: you're going to have to get a common denominator. Do you know what a denominator is? It's the part on the bottom of the fraction. So once you do that, you'll have your answer: it will be 8 and whatever your answer is to the fraction addition part. Good luck! - Doctor Ken, The Geometry Forum
Search the Dr. Math Library:
Ask Dr. MathTM
© 1994- The Math Forum at NCTM. All rights reserved.