Learn math, science, English SAT & ACT from
highquaility study
videos by expert teachers
Thank you for watching the preview.
To unlock all 5,300 videos, start your free trial.
Dividing Radicals and Rationalizing the Denominator  Problem 7
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
In math, we try to leave the denominators of any fraction as rational numbers (as opposed to roots.) If you have a root in the denominator of your fraction, in order to make it rational, you need to multiply both top and bottom of the fraction by that root. This process is called "rationalizing the denominator" because, if done correctly, the bottom of the fraction becomes an integer and the only roots will be in the numerator. You can choose to simplify the root in the denominator either before you begin (which gives you smaller numbers to work with throughout) or after you have multiplied top and bottom you should get the same answer either way.
Transcript Coming Soon!
Please enter your name.
Are you sure you want to delete this comment?
Alissa Fong
M.A. in Secondary Mathematics, Stanford University
B.S., Stanford University
Alissa has a quirky sense of humor and a relatable personality that make it easy for students to pay attention and understand the material. She has all the math tips and tricks students are looking for.
Sample Problems (10)
Need help with a problem?
Watch expert teachers solve similar problems.

Dividing Radicals and Rationalizing the Denominator
Problem 1 9,222 viewsSimplify:
5√8 √3x 
Dividing Radicals and Rationalizing the Denominator
Problem 2 7,448 viewsSimplify:
4 √7 + √10 
Dividing Radicals and Rationalizing the Denominator
Problem 3 7,203 viewsSimplify:
3 √12 + √8 
Dividing Radicals and Rationalizing the Denominator
Problem 4 915 views 
Dividing Radicals and Rationalizing the Denominator
Problem 5 832 views 
Dividing Radicals and Rationalizing the Denominator
Problem 6 880 views 
Dividing Radicals and Rationalizing the Denominator
Problem 7 723 views 
Dividing Radicals and Rationalizing the Denominator
Problem 8 764 views 
Dividing Radicals and Rationalizing the Denominator
Problem 9 899 views 
Dividing Radicals and Rationalizing the Denominator
Problem 10 828 views
Comments (0)
Please Sign in or Sign up to add your comment.
·
Delete