How to Add Fractions that have Different Denominators, Fractions, Pre-Algebra

Your young mathematicians can solve this problem along with Sal. They will add 4/9 and 11/12 by finding a number that evenly divides both 9 and 12. Sal fully explains the process of finding a common denominator in an evident and understandable way. This video would be great for students to watch at home as a refresher, before beginning their homework.