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Lesson 4: Comparing fractions with unlike denominators

# Comparing fractions word problems

Sal practices comparing fractions using real-world contexts.

## Want to join the conversation?

• HOW does he draw so good on the computer
• I don't know, its just depends on his skills
• Like my comment if you think Khan Academy is the best
• i understand this way but is there any easy way to find it ? coz i cant draw the box and compare it like this ?
i use this method to compare more no's , if it is unlike denominators i used to convert all into one deno by doing LCM but i cant use this method here .
• you can think about equivalent fractions
• how is he so good at drawing and teaching on the computer
• Well... you can't actually draw these fractions they don't fit into the same sized strip so making them look like they do isn't accurate, really to draw fractions they have to be equivalent because they have to be equal pieces and fit into the same sized strip to accurately compare them all together.

You can compare 7/8 and 3/4 together and 3/6 and 2/3 together but you can't actually do anything with 5/10 i'm not sure how you make it look like it does but it doesn't. All of these fractions in the video only share 1 Common Multiple too which is 120 (i just ran an LCM Calculator on it because seemingly they didn't share any).

So i guess if you used Least Common Multiple you'd have to keep writing the multiples for each Denominator until you see at least 1 Common Multiple, that's just 1 way to figure these out anyway when we get several fractions where half ARE equivalent and then the other half aren't. That's what's making them harder comparing 3 or more fractions, before for 2 fractions we were using all equivalent fractions.

You can also change them to a decimal number which honestly is far easier, if you're at school they may not let you do that but it's the quickest solution for comparing several fractions.
• i love these questions they are so fun