Monday, December 12, 2011
How to add with Unlike Denominators.
The picture in the post may help you understand how to add with unlike denominators.
First, you must find the Lowest common multiple (LCM) of the denominators. The denominators are the bottom number of the fraction, which tells how many parts of the whole is equally divided into.
In this case, 12 is the lowest common factor of 3, and 4.
Once we have found the LCM, you have to find a way to get your current denominator to twelve. But always REMEMBER. What you do to the bottom, YOU HAVE TO DO TO THE TOP.
So, in order to get 3 to 12, you have to multiply it 4 times. So we end up with Four Twelfths.
Now onto two fourths, which you can also call one half.. In order to get 4 to 12, you have to multiply it by 4 to get to 12. So we end up with six twelfths.
Add all of them together. And you get Ten Twelfths. You don't have to add the denominator.
That is how you add unlike denominators.