Working with Mixed Number Fractions
Date: 1/23/96 at 18:43:56 From: Anonymous Subject: Fractions - operations with mixed numbers I don't really understand what to do. How do I subtract, add, or multiply a mixed number fraction?
Date: 3/18/96 at 16:57:4 From: Doctor Patrick Subject: Re: Fractions - operations with mixed numbers Hi - When you want to work with mixed number fractions the first step is to change the fractions from a mixed number to a "top heavy" fraction. For example, 2 1/3 would become 7/3. You do this by multiplying the whole number, (in this case the 2), by the denominator (3) and add the number you get to the numerator (1). So, 2 * 3 + 1 =7. This is your new numerator. The denominator doesn't need to change for this step. Do you understand how this works? What would 3 2/5 be changed to? After you change the fractions you work with them just like normal fractions. How would you solve 1 1/2 - 2/3? There is also the case where you only have a whole number and no fraction in a problem, such as 2 - 1/2. In that case, you can write the number as the number (for example 2) over 1 since 2/1 is the same thing as 2. From there you can go on and solve the problem the way you would normally. -Doctor Patrick, The Math Forum
Search the Dr. Math Library:
Ask Dr. MathTM
© 1994- The Math Forum at NCTM. All rights reserved.