@@4nything_c4t_xoit's literally the method you learn in school just visualized. You basically just multiply them with the other denominator so that they have the same one so that you can just subtract. It's the exact same thing
@@YT-AlexTM Teachers have very specific requirements, especially math teachers for showing work. Sadly I don't think this counts as showing work, but you can learn it their way and check it using the hack in this video!! ❤️😼
what annoyed me whenever i was first learning this was that my teachers didn’t want us to use this method, even though they are the ones saying, “work smarter, not harder”, like dang, this is way easier than tables and stuff.
@@ACatThatPlaysRoblox14Asslam o alikum. It is right. The reason it is right: A/B - M/N both fractions need to have common denominators. AN/BN - MB/NB then subtract. AN - MB/ NB. Which is the same if we used the butterfly method A/B - M/N. Where we mulipy A×N and M×B then we subtract. Then the doemaintor is NB. Also I used this trick today and it saved a lot of time. So thanks for the video.
literally needed to know this today for my maths test Edit: For anyone that wanted to know what I got it was 163/240 :) (3 marks of an 8 😫) edit2 lmao looking back now seeing how i couldnt even subtract fractions
@@stormswindy3013 What are you even on? This is how people naturally do things once they understand the concept. It’s just that you are an NPC who is incapable of grasping literally the most elementary arithmetic.
To the replies, rule 4 ignores the multiplication. For example, denominators 4 and 6's lcm (least common multiple) is not 4 x 6 (24), it's 12 because they go to 12 together before 24.
“Aww i can use this for my 2nd grade sister since shes stuck in math!” “O- MULTIPLYI-“ Edit: guys- please stop replying with “they dont do that in 2nd grade” and stuff. Its really annoying tbh. And, also.. I know. I said “O- MULTIPLYI-“ and meant “Oh- Multiplying-“ because there was multiplication and they dont do that in 2nd grade. Will you all please drop it now? Thank you!!
I call it cross multiplying because i think thats what its call (not trying to sound rude) but my teachers also called it the butterfly method in elementary school
My 5th grade math teacher said she would never teach the butterfly method because, you might have to simplify, which most of us didn’t know how to do at the time.
Btw, this method is called "χιαστί" in greek. And its the most easiest method i have ever knew when i was in elementary school. (Depends if you know proliferation though, because if you don't then im sorry.)
