###### Alissa Fong

MA, Stanford University
Teaching in the San Francisco Bay Area

Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts

##### Thank you for watching the video.

To unlock all 5,300 videos, start your free trial.

# Adding/Subtracting Fractions- Unlike Denominators - Concept

Alissa Fong
###### Alissa Fong

MA, Stanford University
Teaching in the San Francisco Bay Area

Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts

Share

If we try to add fractions with unlike denominators, we run into trouble because they represent different sized pieces of a whole. We could estimate the final sum or product based on a picture or estimation, but we can be exact if we first re-write the fractions with common denominators. In doing so, we don't change the value of either fraction, but make them into a form that makes more sense to add. Look for equivalent versions of the two fractions that have the same bottom (which is called finding a common denominator.)

Transcript Coming Soon!