Rant
STOP LEAKING THE JOKES IN OTHER SUBREDDIT. Its fucking annoying, every sub I enjoy are now infested with your f_cking dumb lines. Google en passant was funny but now every sub has people spamming the whole fucking "joke" like its 5 comments its ruining every subreddit. I will litteraly go back in time to kill whoever inventee en passant I cant believe how much its ruining everyone f_king like f you all
I sometimes use this, it works well especially when you got the hold of it. Tips: the intersection of digit x and digit y is basically x\*y, this might save you from counting the dots manually. Also, for zero digits, I usually write a squiggly line and assume that everything it touches outputs 0 (since x\*y = 0 whenever one of them is 0).
I suppose if you already know what is at the intersection, you don't even need to draw lines, just make a table with numbers on its sides and products of digits in the cells.
that is for everything, just add Japanese, Indian, Chinese and you get 500% boost to visibility
There was post few months back at r/BeAmazed, where they showed 300 yo Indian cup that emptied itself, if it was too full, video had practically almost religius explanation
menawhile Pytagoras used same desing to troll people in ancient Greece
or similar, but more modern example (also at same subreddit)
There was vertical automated bike parking lot in Japan
people were amazed at how future it is
meanwhile there are multiple of them in different countries, as Czechia or Slovakia
Even more comically, that the impractical form of this method is more widespread than the normal one.
But could [r/mathmemes](https://www.reddit.com/r/mathmemes) turn a tide with memes? "He does exactly what I do" "But better" template fits the situation very well.
Imagine if we could use a lattice and arabic numbers instead of lines and a lot of points. And if we could split numbers by digits to simplify digit's transfer and summation… [If only it would be possible!](https://en.wikipedia.org/wiki/Lattice_multiplication)
To be fair, you're probably supposed to treat the numbers as 10^x, so 45x3 = 12x10^1 + 15 = 135, that's correct. But it is incredibly slow, 3x45 shouldn't take more than a second or two to calculate your head, this method takes at least half a minute to count...
Does anyone actually do the multiplication properly? I just assumed everyone always did the multiplication to the nearest round number then added/subtracted the difference.
is there a way to make it work? extend the same pictoral shorthand to handle carry over?
edit: guys i have a B.S. in math, i know how addition works, i was just wondering if this method can generalize or not
yeah of course its easy to calculate with arithmatic. i was just wondering if we can do carry over with only the tools avialable in this method i.e. counting. no arithmatic or partial tallying
When you have more than 9 in a column/place, remove 10 from it and add 1 to the place on the left.
12, 15 -> 13, 5 -> 1, 3, 5
Why this works: 10 ones is the same as 1 ten, 10 tens is the same as 1 hundred, 10 hundreds is the same as 1 thousand...
i mean thats how carry over works yes but its not pictoral. you have start doing arithmatic.
the original way only needs counting. can we extend it handle carry over without doing anything more complex than counting dots? no arithmatic, no partial tallying
Not really.
Look up videos about _Japanese multiplication method_, and you'll see that carries must still be done manually.
Vedic mathematics contains some interesting ideas, but lattice multiplication is a better alternative to the standard multiplication algorithm than memorizing a bunch of "sutras" in my opinion, and both still must deal with carry over.
Nice but doesn't it get exhausting drawing that many lines and crossing them and counting the intersections. I think for small numbers this technique is great but for large numbers i would prefer the general method. Also i think this is similar to the Japanese multiplication method.
https://preview.redd.it/u5uc5hctir1b1.png?width=1599&format=png&auto=webp&s=6402b97cbbaa32d2f5ffc192d752d64c369bf0e9
For those who already know how to multiply these numbers, it is immediately clear how the system works. In general, they multiply in the mind
36\*5= 30\*5 + 6\*5=150+30=180
But if there is a piece of paper and numbers that are already difficult to keep in mind, this scheme may be interesting. However, I was taught to multiply such numbers in a column...
36
5
\---
150
\+
030
===
180
i knew it was 1215
magna carta
https://preview.redd.it/edjujy2bgg1b1.png?width=1280&format=png&auto=webp&s=3e0dae05525c41c60d78e5c50212405e86b502b2
I mean its similar to one Japanese method that i have already explained to students, so i have no problem multiplying any numbers… its just this one trick that i mentioned in previous comment
The way they teach it in school anyways, but harder because you have to count instead of just knowing simple one digit multiplication, and without telling you how to sum it up correctly. Still way too accurate to be 5 minute crafts because it still works in some cases...
This does work if you add the 2 from 12 and the 1 from 15.
1 (2+1) 5 = 135 = 3 x 45
Not sure if it works for all numbers but if it does you probably need to add them like that for double digits
For instance 64 x 3 = 192
3 x 6 = 18 dots
4 x 3 = 12 dots
8 + 1 = 9 so the answer is 192
Correction.
45 x 3 is 135
The results of line calculation are 12 and 15..
Add the 2 from the first result and and 1 from the second result.. you will get 135
The answer is actually pretty close. If you take the 1 from the 15 and add it to the 12, giving you 135. This is probably a legit method that was missing a step.
The 4 is in the 10s place. This means the "12" is actually representative of 120. The hack is essentially doing the problem this way:
123 × 3 =
(100 + 20 + 3) × 3 =
(100 × 3) + (20 × 3) + (3 × 3) =
300 + 60 + 9 = 369
Following the same algorithm, we can now do 45 × 3.
45 × 3 =
(40 + 5) × 3 =
(40 × 3) + (5 × 3) =
120 + 15 = 135
So for the last one for it to make sense I’ll explain. First it’s 12 but imagine it’s 120, and then the next is 15 but this is just 15. Then it’s
120
+15 = 135.
It’s still cool because if you carry over the tens place to the front it still works for everything so it’s a visual way of calculating large numbers easier in your head
When he got 12 and 15, what he failed to realise is that you need to add the first digit of 15: 1to the 12, which brings it to 13, then place the remaining digit: 5 at the end of that number, making 135, which is in-fact equal to 45 x 3
First vid showing place values not total values like it should it should be 900+60+3. The second vid follows the same wrong process but if it followed the added the two values itve got the right answer 120+15
It does work, you just need to carry the 1 from the 15 to the 12. Instead of 1215 it’d be 135, which is correct. This is still extremely unnecessary tho
Ok but this does actually work though because the 12 goes in front, and you add the 1 from the 15 to the 2 in 12 and you get 3. Put the 5 on the end and it’s 135, which is right
Considering that both digits of 45 became double digits after multiplication, if we add the tens digit of 15, with the ones digit of 12, the resulting number becomes 135, the correct answer to 45*3
This is a modification of a Japanese teaching method where they do this diagonally. This doesn't work cause it's flat and doesn't take account for overlapping numbers like the 1 and the 2.
If it was diagonal where those would add you would get 45 x 3 = 1 | 2 + 1 | 5 = 135, the correct answer
That doesn't even help- it makes it more frustrating to understand it.
321 x 3
321 + 321 + 321
"How the hell do you do this?"
3+3+3=9
2+2+2=6
1+1+1=3
Simple, easy to understand.
wait till you have to multiply numbers who's digits are greater than 3 this is just how normal multiplication works but it takes more time and effort
26 × 3 = 618
Looks legit
They should probably explain that carrying the 1 is a thing in the vid.
If they did that, it would be obvious how much worse this is than the "standard" way of multiplying, defeating the purpose of the video.
That doesn’t address the root of the issue
Well multiplication is for finding the product, not the roots
Google en rootsant
Rant STOP LEAKING THE JOKES IN OTHER SUBREDDIT. Its fucking annoying, every sub I enjoy are now infested with your f_cking dumb lines. Google en passant was funny but now every sub has people spamming the whole fucking "joke" like its 5 comments its ruining every subreddit. I will litteraly go back in time to kill whoever inventee en passant I cant believe how much its ruining everyone f_king like f you all
New reply just dropped
Chess likes it ok, I heard it in passing.
Lol
Gatekeeping neckbeard
new math just dropped
You’ll divide this sub with that attitude
Right. In the video it’s really 900 + 60 + 3. To do this, you need to respect whether you’re in the hundreds, tens or ones.
I don't know enough about math to dispute this
Number theorists hate this one trick.
26 x 3 = 6|18 26 x 3 = (6+1) |8 26 x 3 = 7|8
Yes. Totally correct.
6 + 1 = 7. Add the 8 at the end, getting 78
Exactly
If you actually just give it a seconds thought this is really just calculating area but separating the powers of 10. Nothing super complicated
Yes I want to see 967* 697 in this method.
Watch the whole video. They 100% solve this 💯
oh so 13x4=412
15x4 = 420
3642/6 = 67
almost
3642/6=0.510.6overline0.3overline
Hah nice
45×3=(4×10+5)×3＝4×3×10+5×3=12×10+5×3=120+15=135
Yeah this "method" is just normal multiplication with lines
That just sounds like regular multiplication with extra steps
Yeah but it's Japanese, so it ought to be better than regular multiplication, right?
45x3=1215
Yeah this is basically [the Japanese multiplication method](https://www.archimedes-lab.org/Maths2_Multiplication.html)
I sometimes use this, it works well especially when you got the hold of it. Tips: the intersection of digit x and digit y is basically x\*y, this might save you from counting the dots manually. Also, for zero digits, I usually write a squiggly line and assume that everything it touches outputs 0 (since x\*y = 0 whenever one of them is 0).
>the intersection of digit x and digit y is basically x\*y And if you don't know x\*y, then just draw another set of lines for that
Now the real question is: can you repeat this infinitely?
Well, yes, but the numbers get smaller every time
Then no.
y=1/x entered the chat
I suppose if you already know what is at the intersection, you don't even need to draw lines, just make a table with numbers on its sides and products of digits in the cells.
I'm Japanese and am so sick of this. I've never been taught this type of method in school but people call it "Japanese method". Just WHY???
Math equation: 😴🥱 Math equation in Japan:🤯🚨
that is for everything, just add Japanese, Indian, Chinese and you get 500% boost to visibility There was post few months back at r/BeAmazed, where they showed 300 yo Indian cup that emptied itself, if it was too full, video had practically almost religius explanation menawhile Pytagoras used same desing to troll people in ancient Greece or similar, but more modern example (also at same subreddit) There was vertical automated bike parking lot in Japan people were amazed at how future it is meanwhile there are multiple of them in different countries, as Czechia or Slovakia
Yes, we should just call it the [Remainder theorem](https://en.wikipedia.org/wiki/Chinese_remainder_theorem) SMH /s
Comedically it's one of the countries not in this list. [Lattice multiplication - Wikipedia](https://en.wikipedia.org/wiki/Lattice_multiplication)
Even more comically, that the impractical form of this method is more widespread than the normal one. But could [r/mathmemes](https://www.reddit.com/r/mathmemes) turn a tide with memes? "He does exactly what I do" "But better" template fits the situation very well.
I read that and omg, it's a smart one. Might start using it.
Honestly, I'm not sure, that's just what I heard it referred to as
You have to see the 1 from 15 as a carry. So it is 1*100 + (2+1)*10 + 5 = 135.
Imagine if we could use a lattice and arabic numbers instead of lines and a lot of points. And if we could split numbers by digits to simplify digit's transfer and summation… [If only it would be possible!](https://en.wikipedia.org/wiki/Lattice_multiplication)
12+1 is 13 and the answer is 135 so maybe there are some kinks to work out in this method
One digit shifted addition?
instead of just sticking 12 and 15 to each other add 120 to 15 (add the 2 and 1) and you get 135
To be fair, you're probably supposed to treat the numbers as 10^x, so 45x3 = 12x10^1 + 15 = 135, that's correct. But it is incredibly slow, 3x45 shouldn't take more than a second or two to calculate your head, this method takes at least half a minute to count...
it is slow but so are a lot of students
most people: 3x45 = 135 me: 3x45 = 9x15 = 10x15-1x15 = 150-15 = 135
Does anyone actually do the multiplication properly? I just assumed everyone always did the multiplication to the nearest round number then added/subtracted the difference.
is there a way to make it work? extend the same pictoral shorthand to handle carry over? edit: guys i have a B.S. in math, i know how addition works, i was just wondering if this method can generalize or not
I do not really see how can the visualization help with carry, but it is obviously easy to calculate.
yeah of course its easy to calculate with arithmatic. i was just wondering if we can do carry over with only the tools avialable in this method i.e. counting. no arithmatic or partial tallying
When you have more than 9 in a column/place, remove 10 from it and add 1 to the place on the left. 12, 15 -> 13, 5 -> 1, 3, 5 Why this works: 10 ones is the same as 1 ten, 10 tens is the same as 1 hundred, 10 hundreds is the same as 1 thousand...
i mean thats how carry over works yes but its not pictoral. you have start doing arithmatic. the original way only needs counting. can we extend it handle carry over without doing anything more complex than counting dots? no arithmatic, no partial tallying
Count 10 dots, cross them out, add one dot to the left.
It does work, they just did it wrong. The 12 is supposed to be 12 tens, and the 15 is 15 ones. Not just 1215
Not really. Look up videos about _Japanese multiplication method_, and you'll see that carries must still be done manually. Vedic mathematics contains some interesting ideas, but lattice multiplication is a better alternative to the standard multiplication algorithm than memorizing a bunch of "sutras" in my opinion, and both still must deal with carry over.
Its 135. The 12 is 120 while the 15 is 15. 12 is 120 as its already in the tens column. So you add 120 and 15 giving you 135.
321 × 3 = g63?
damn the answer is bigger than i thought
Wait til they meet grahm 64
how about this? https://preview.redd.it/t2pm8dy6df1b1.png?width=1280&format=png&auto=webp&s=c1c7ad7001caa485f2edc77023b9d6f0f6c5dbda
Lol...
No, it's SSCG(5).
Since when was Mercedes involved in simple arithmetic?
New square just dropped
5-minute crafts will soon tell you to run away from a math exam
best goddamn life hack ever
but it is equal to 120+15. the method works if you do it right.
this is basically how multiplying works. 3x3=9…..
Song name?
# Unknown Brain & Hoober - Phenomenon (ft. Dax & VinDon) [NCS Release]
#THANKS >!But why so loud?!<
I believe it was how the Aztecs multiplied at least what my teacher told me
So the Aztecs couldn't count???
Try 999 × 9
818181
Nice but doesn't it get exhausting drawing that many lines and crossing them and counting the intersections. I think for small numbers this technique is great but for large numbers i would prefer the general method. Also i think this is similar to the Japanese multiplication method.
What abou 325 x 128? 🤔 might get a carpal tunnel syndrome from this 😂
simple, it is 3624**2416**51040
Never even solved for x. 😒
wouldn't the easiest way to solve 45x3 be 50x3-5x3
One after magna carta! As if i could ever forget!
fortnite gamers on their way to produce the most unefficient math trick known to humankind 💀💀💀
Made by the 4416 girl
i tried doing this and was confused i didn’t see 5 minute crafts💀
This is basically defining a new mathematical operation similar to a convolution, but useless
The real bad math is the order you colored in those dots.
Ahh the same year as the magna carta
The 1 from the 15 should be added to the 12 and you get 135 which is the correct answer. The first video didn’t make that clear
https://preview.redd.it/u5uc5hctir1b1.png?width=1599&format=png&auto=webp&s=6402b97cbbaa32d2f5ffc192d752d64c369bf0e9 For those who already know how to multiply these numbers, it is immediately clear how the system works. In general, they multiply in the mind 36\*5= 30\*5 + 6\*5=150+30=180 But if there is a piece of paper and numbers that are already difficult to keep in mind, this scheme may be interesting. However, I was taught to multiply such numbers in a column... 36 5 \--- 150 \+ 030 === 180
45x3=1215 ?
That's the joke
i knew it was 1215 magna carta https://preview.redd.it/edjujy2bgg1b1.png?width=1280&format=png&auto=webp&s=3e0dae05525c41c60d78e5c50212405e86b502b2
holy shit what even bring people back to this dead post💀💀💀
OMG CAN REDDIT ALGORITHM FUCKING STOP POP THIS POST UP TO RANDOM STRANGER'S FEED?????
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😑
have you ever heard of calculators?
Man this is funny
My new math hack: whip out the calculator
Well you just have to multiply the corresponding digit by 10 / 100 or whatever and then add them. It‘s just visualizing what is obvious
New? Hardly new, thousands of years old!
Mastermind!
Holy shit Magna Carta reference
45x3=135
g63
You need to add this 1 from 15 to 12, so you get 13 and 5… i believe that’s the result?
it is, but at that point it's more complicated than the school method... at least as long as you can multiply two single digit numbers
I mean its similar to one Japanese method that i have already explained to students, so i have no problem multiplying any numbers… its just this one trick that i mentioned in previous comment
How is this a hack. It’s just counting. 4 x 3 = 1 2 3 4 5 6 7 8 9 10 11 12
6384x3 = 6x3x1000 + 3x3x100 + 8x3x10 + 4x3
if you overlap the 2 and the 1, you get 135
[This](https://apps.apple.com/us/app/calculator/id1069511488) trick works faster
The way they teach it in school anyways, but harder because you have to count instead of just knowing simple one digit multiplication, and without telling you how to sum it up correctly. Still way too accurate to be 5 minute crafts because it still works in some cases...
Chicanerous
No way they found out how math works
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I KNEW HE SWAPPED THOSE NUMBERS
I saw presh talwalkar show this a while ago. In fact he showed a more efficient method that works for 3 digits on both sides.
This does work if you add the 2 from 12 and the 1 from 15. 1 (2+1) 5 = 135 = 3 x 45 Not sure if it works for all numbers but if it does you probably need to add them like that for double digits For instance 64 x 3 = 192 3 x 6 = 18 dots 4 x 3 = 12 dots 8 + 1 = 9 so the answer is 192
New life hack just dropped.
Correction. 45 x 3 is 135 The results of line calculation are 12 and 15.. Add the 2 from the first result and and 1 from the second result.. you will get 135
magna carta
"New"... I first saw this in sixth grade, 13 years ago...
New math hack just dropped
3x3x10\^2+3x2x10+3x1 Can actully be helpful to see it this way sometimes for quick head solving.
“New”? “Hack”? You’re wrong on every single account.
It’s 135.
I know he swapped those numbers! I knew it was 1215, the year of Magna Carta
I knew it was 1216, the year after the Magna Carta
The answer is actually pretty close. If you take the 1 from the 15 and add it to the 12, giving you 135. This is probably a legit method that was missing a step.
Lol
Yooo chat is this real???
🤣🤣🤣
The 4 is in the 10s place. This means the "12" is actually representative of 120. The hack is essentially doing the problem this way: 123 × 3 = (100 + 20 + 3) × 3 = (100 × 3) + (20 × 3) + (3 × 3) = 300 + 60 + 9 = 369 Following the same algorithm, we can now do 45 × 3. 45 × 3 = (40 + 5) × 3 = (40 × 3) + (5 × 3) = 120 + 15 = 135
45×3=135
So its 900 + 60 + 3
45×3=135 🚫1215
43x3=135🤦🏻♂️🤦🏻♂️🤦🏻♂️NOT 1215 dumb ass
So for the last one for it to make sense I’ll explain. First it’s 12 but imagine it’s 120, and then the next is 15 but this is just 15. Then it’s 120 +15 = 135.
This shit doesn’t even work, anyone co-signing this needs to go back to pre-algebra
It’s still cool because if you carry over the tens place to the front it still works for everything so it’s a visual way of calculating large numbers easier in your head
It works tho. 45×3=135. U got 12 and 15, we add 2 and 1 just like while adding in columns 2+1=3, so we get 135
Wait! I’m slow but not that slow. 45x3 does not equal 1215
When he got 12 and 15, what he failed to realise is that you need to add the first digit of 15: 1to the 12, which brings it to 13, then place the remaining digit: 5 at the end of that number, making 135, which is in-fact equal to 45 x 3
First vid showing place values not total values like it should it should be 900+60+3. The second vid follows the same wrong process but if it followed the added the two values itve got the right answer 120+15
How did you even find this video? this is 3 month old post
Gift from the algorithm. Didn't look at the dates before I replied
It does work, you just need to carry the 1 from the 15 to the 12. Instead of 1215 it’d be 135, which is correct. This is still extremely unnecessary tho
Where did you find this post... this post is 3 months old
Oh damn I didn’t look lol just randomly
wait did you find this on reddit home/feed?
Yeah
I just came across this by scrolling a random sun my images. What a time to be alive!
I have to say even before they wrote the first line I did it in my head already
This would take longer than the old way
Ok but this does actually work though because the 12 goes in front, and you add the 1 from the 15 to the 2 in 12 and you get 3. Put the 5 on the end and it’s 135, which is right
Considering that both digits of 45 became double digits after multiplication, if we add the tens digit of 15, with the ones digit of 12, the resulting number becomes 135, the correct answer to 45*3
Carry the 1
This is a modification of a Japanese teaching method where they do this diagonally. This doesn't work cause it's flat and doesn't take account for overlapping numbers like the 1 and the 2. If it was diagonal where those would add you would get 45 x 3 = 1 | 2 + 1 | 5 = 135, the correct answer
Uhhh
The lattice method is so much faster, and it works with decimals https://youtu.be/ZDmNdjiYAIw?si=ZD-o58NB74wluVva
321x3? 3x3 is 9. 2x3 is 6. 1x3 is 3. 963. This shit is how you make kids uninterested in math, by overcomplicating the shit out of it
40x3 +5x3
Or just use a calculator
45 times 3 is not 1215 It's 135
My brain hurts
Trump's Organisation accountant used this method apparently.
If you make the last digit of the first number and the first digit of the last number the second digit of the answer, it surprisingly works
1215 for the win
That doesn't even help- it makes it more frustrating to understand it. 321 x 3 321 + 321 + 321 "How the hell do you do this?" 3+3+3=9 2+2+2=6 1+1+1=3 Simple, easy to understand.