Monday, December 12, 2011

Adding with Unlike Denominators.

To add with Unlike Denominators you must follow these steps.

1)Find the common denominator but it must be the LCM (Lowest Common Multiple).

A Multiple- Is the product of any given number and natural number like 1,2,3.
eg. Multiple of 3 are ; 3,6,9,12,15,18,21 etc.

Multiples of 2 are 2,4,6,8,10,12,14,16,18 Multiple of 5 are 5,10,15,20,25,30,35,40

You can't add that, so you have to find the common multiple .

Multiple of 4- 4,8,12,16,20,24,28,32,
Multiple of 6 - 6,12,18,24,30,36,42
12 is the common multiple between those numbers.

The next step is to put " 12"(in this case) The new denominator and whatever you multiply in the bottom, you must do in the top.

The last step is to add it all up.


  1. This comment has been removed by the author.

  2. Good job, Jessica! I liked how you explained it by the pictures.

  3. Awesome job Jessica! I like how you added pictures to show what you were talking about.I also liked how you explained the steps, it was really easy to understand how to add fractions with unlike denominators. Great job!

  4. Good job! Very nice. I liked how you added pictures. I also really liked how you bolded the key words. Good job, keep up Jess!

  5. Nice job Jessica! I like how you included pictures to your post! It made it easier for me to understand how to add fractions with unlike denominators! I also like how you changed the words into different color, to make the important words stand out! Keep it up!

  6. Good job with the pictures it helped a lot.