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Lesson 3: Adding and subtracting fractions: word problems

# Fraction word problem: piano

Sal solves a fraction word problem about practicing piano.  The fractions have common denominators. . Created by Sal Khan.

## Want to join the conversation?

• At , what is 3/4 of an hour, I kind of forgot.....
• Well a hour has 60 minutes right?
Thus 3/4 of 60 = 60*3 / 4 = 180/4 = 45 minutes!
• how much is 1/4 of an hour?
• 1/4 of an hour would be. 4/4 of an hour would be 60 minutes, so in order to get 1/4 you would need to divide 60 by 4. As a result, you would get 15 minutes.
• so 3/4 of an hour is 45 minutes right
• Yep! Exactly. Since 60/4=15, then multiply by 3 since it 3/4, so it would be 15*3=45, :)
• Yes... but remember to reduce your fraction. Fractions in answers should always be fully reduced.
2/4 = 1/2
• Hey! This video is not working what should I do
My internet is there I have completely 237 GBR left with me out of 500 gb
And I am using it
• Go to the "help center" link at the bottom of the page and try looking in "troubleshooting"
• how can i represent my answer with picture numbers and words
• Basically, you can draw shapes that can be divided, then split it into the number of parts, then label the # of shapes and pieces. (Lastly, write the heading of your answer, such as: Mrs Ken's remaining cookies).
Try to keep the shapes as close to the topic as possible, it can help you guarantee a correct answer. For example, parts of cookies should be represented using circles.
• why so much videos and why not more math problems?
• Videos are for learning and problems are for practice. Also, there are enough problems. If you want more, buy a workbook or google some problems.