Butterfly method for fractions

A simple procedure to add fractions of different denominators.

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If you purchase through these links, I may be compensated for purchases made on Amazon. As an Amazon Associate I earn from qualifying purchases. This does not affect the price you pay.

Book ratings are from January 2023.

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Mind Your Decisions: Five Book Compilation
A collection of 5 books:
"The Joy of Game Theory" rated 4.3/5 stars on 290 reviews
"The Irrationality Illusion: How To Make Smart Decisions And Overcome Bias" rated 4.1/5 stars on 33 reviews
"40 Paradoxes in Logic, Probability, and Game Theory" rated 4.2/5 stars on 54 reviews
"The Best Mental Math Tricks" rated 4.3/5 stars on 116 reviews
"Multiply Numbers By Drawing Lines" rated 4.4/5 stars on 37 reviews

Mind Your Puzzles: Collection Of Volumes 1 To 3
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"Math Puzzles Volume 1" rated 4.4/5 stars on 112 reviews
"Math Puzzles Volume 2" rated 4.2/5 stars on 33 reviews
"Math Puzzles Volume 3" rated 4.2/5 stars on 29 reviews

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[HighlandHellboy]

This is the way I calculate fractions in my head, but I've never seen it laid out like this!

[crimson]

I remember when I learned of cross multiplying. It's so elegant and simple yet extremely potent.

[antorachakraborty]

Butterfly Method is very easy I will teach my student.

[claudiomarvel]

that's just the normal method, lol

[HarisRehmanGG]

Best visuals ever, the song fits the title

[piguy]

If both fractions are unit fractions, it gets even nicer: 1/a + 1/b = (a+b)/(ab)

[smh]

This trick is very easy to understand. To add fractions you have to have the dame denominator. And you can multiply the numerator and denominator with the same coefficient so it's still the same fraction. To have the same denominator, you know that 7*5=5*7 so you just multiply the numerator and denominator by 5 and the other by 7.

[RichardButt]

I think he accidentally used Bumble Bee instead of Butterfly for the music.

[jonathanli]

The video: Butterfly
The song: Bumble Bee

[mustafaakbas]

Yöntem doğru fakat, her zaman en sadeleşmiş halini vermez.Yani en küçük ortak paydayı bulmak, sonucu kestirebilmek bakımından, daha doğru bir yöntemdir diye düşünüyorum.

[MrCoxmic]

It is a trick that works but does not actually lead to understanding the math; as a general rule I don't do tricks. If all you want is an answer to a basic arithmetic exercise use a calculator instead of a trick. Too many kids will mis-apply the trick thinking it will always work since they do not actually understand what the algebra is saying.

[Abu_king]

That is smrh called cross multiplication

[ProtogenFurroFelizNavida]

Solo vine porque me gusta la canción xd xd xd

[NXT_LVL_DVL]

Tell me an alternate way . Don't be childish enough to say " multipy numerator and denominator by a number so that denominator is the LCM of the two denominators " 😂

[sheshagiris]

This was taught by our Shashi sir .and Veda mam

[akhpak]

My teachers call this method cross multiplication

[primopierre]

Barbie music would have been more appropriate 🤣🤣🤣

[jdramirez]

So finding the least common denominator?

[trapezius]

Music choice? Is this channel for teenage girls?

[joseph-wlpl]

butterfly method and listing method is the same