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### Course: 4th grade>Unit 8

Lesson 3: Adding and subtracting fractions: word problems

# Fraction word problem: spider eyes

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

## Want to join the conversation?

• what if the two top numbers are bigger than the bottom number like this: 2/8+7/8=9/8
• I think you need to multiply the two denominators that aren't the same and find the LCM
• Where do you get the spider problem when its not in in the practice?
• It's just an example. Not all video problems are the same as practice problems.
• Why spiders khan academy?? Why not deserts?
• what are spider eyes in math
• its just a demonstration.
• does this mean that spider can see with 360degree??
• why u got 2mil points?
• So, fractions do not only represent equal parts of a whole, but are groups or things?
• True. If a class has 30 students and 28 are present at morning assembly then 28/30 are present. The whole in this case is all the students of the class combined. (This can be simplified to 14/15 though in a real case scenario it probably wouldn't be).

You can make such a set out of whatever you feel like: books you've read out of all the books you own. Capitals you've visited out of all the capitals in the world etc.
• it makes sents
and its making me sherver