3 Common Mistakes Made when Adding and Subtracting Fractions with Unlike Denominators


  1. When adding and subtracting fractions with unlike denominators, a common mistake many of my students’ make is not renaming the fractions. The first step
    is to rename the fraction using a LCD (lowest common denominator). For example, let us take a look at the
    following problem:





  1. 2. The second mistake that is quite common many of
    my students make when adding and subtracting fraction is adding the numerators
    and denominators. You are only supposed to add the numerators. The denominators
    stay the same:





  1. 3. Another mistake that is also common when adding
    and subtracting fractions is not simplifying the fraction to lowest terms. The
    above example is in lowest terms. The following example is not so we have to
    simplify it:









Views: 4658

Comment

You need to be a member of Math Concentration to add comments!

Join Math Concentration

Advertising Information

If you represent a company and would like advertising, sponsorship, or promotions information, CLICK HERE to request our media kit.

Make a Difference

Please support our community of students, parents, and teachers or caregivers who all play vital roles in the homework process by contributing whatever you can to keep our site alive :)

Members

Notes

Figure This Challenge #56

  • Complete Solution will be given on May 17, 2015

Complete Solution:

 …

Continue

Created by Wanda Collins May 10, 2015 at 1:56pm. Last updated by Wanda Collins May 10, 2015.

Math Homework Help Online

Professional math homework help get your math solved today.

Do you need help with math homework? Our reliable company provides only the best math homework help.

Try best college paper writing service to get the best custom essays for affordable prices

Fun Math Facts:

Math Limerick

Question: Why is this a mathematical limerick?

( (12 + 144 + 20 + 3 Sqrt[4]) / 7 ) + 5*11 = 92 + 0 .

Answer:

A dozen, a gross, and a score,
plus three times the square root of four, divided by seven, plus five times eleven, is nine squared and not a bit more.

---Jon Saxton (math textbook author)

Presentation Suggestions:
Challenge students to invent their own math limerick!

The Math Behind the Fact:
It is fun to mix mathematics with poetry.

Resources:

Su, Francis E., et al. "Math Limerick." Math Fun Facts.

funfacts

Pre-K, Kindergarten, First, Second, Third, Fourth, Fifth, Sixth, Seventh, Eighth, Ninth, Tenth, Eleventh, Twelfth, Higher Education, Adult Education, Homeschooler - TeachersPayTeachers.com

Photos

  • Add Photos
  • View All

Badge

Loading…

   Excellent!
   Very Good
   Good
   Fair
   Poor
&


AmericasBest.com