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Lesson 5: Adding and subtracting fractions with unlike denominators word problems

# Adding fractions word problem: paint

Sal solves a word problem by adding mixed numbers with unlike denominators. Created by Sal Khan.

## Want to join the conversation?

• you are confusing me about splitting the bar graph • Splitting the bar graph really isn't at all confusing.It means that you divide something into fractions so you can understand better.The best object to use is a bar graph.Sal divided the first two into different fractions.Then, when you converted the two into fractions with same denominators,you add them together.When you add it,you get the answer,which Sal demonstrated in the third bar graph. So it is not confusing at all.Thanks for reading this reply! • thank u for helping me i think ima get a 100 • question when looking for a common denominator
must it be the lowest you can find or can it be just any?
(1 vote) • A common denominator cannot be "any" number, because it has to fit both fractions. However, it can be "any" fitting number. The reason you want it to be a smaller number is that it makes adding and simplifying easier. (see simplifying fractions) I hope this helped!
• ok so i dont know how to divide
and im really bad at math • hi sal • u going to fast slow down • i need help with sum'm. Khan is asking me this question:
tetras------1/6
guppies-----2/5
goldfish----1/4
What fraction of Kathy's fish are either tetras or guppies?
The thing is: do I just add them all(INCLUDING GOLDFISH) up and then divide---if it's possible----the sum of that by the sum of the guppies AND the tetras added together? What do I do? Because THIS video didn't help!
(1 vote) • I need help with EVERYTHING  