Yeah, I'd be concerned seeing a child with fingers like that. Like, what would they be feeding him? Ground beef, 15 raw eggs, with a pound of sugar.. Maybe a sprinkle of salt? LMFAOO
Device helping with multiplication/division of 9 is like the second most useless tool I can imagine right after tool that helps with multiplication/division of 10's.
And genuinely looking at this tool it feels like it takes more brain power to use this rather than.. you know, calculate it.
Even more fun, if it is a large number, like 494784, and the sum of the digits are more than one digit, 36, do it again and it will be 9 if the original number was divisible by 9.
Please put an NSFW tag on this. I was on the train and when I saw this I had to start furiously masturbating. Everyone else gave me strange looks and were saying things like “what the fuck” and “call the police”. I dropped my phone and everyone around me saw this. Now there is a whole train of men masturbating together at this. This is all your fault, you could have prevented this if you had just tagged this post NSFW!
You can do the same to find out if a number is divisible by 3 if the digits add up to 3. The algorithm can be repeated untill you can tell at a glance if the number is divisible.
There are simple rules (except for 7, that one is weird) to check divisibility up to 12.
2 if the last digit is divisible by 2
3 if the sum of all the digits is divisible by 3 (this can be done multiple times until it's easily verifiable, e.g. 167415 -> 1+6+7+4+1+5 = 24 (it is divisible by 3 but to further the example) -> 2+4 = 6)
4 if the last 2 digits are divisible by 4
5 if the last digit is 5 or 0
6 if the number is divisible by 2 and 3
8 if the last 3 digits are divisible by 8 (this one is not as straight forward but still useful)
9 if the sum of all digits is divisible by 9 (the algorithm can be repeated as in the case of 3)
10 if the last digit is 0
11 if the difference between the sum of the odd position digits and the even position digits is 0 or divisible by 11 (algorithm can be repeated but it's somewhat time consuming)
12 if the number is divisible by 3 and 4
7 this is kind of weird and not very easy to do on the fly but it exists. Take the last digit and double it. Subtract it from the original number sans the last digit and if the result is divisible by 7 then so is the original (e.g.1036 -> 103 - 12 = 91 -> 9 -2 = 7)
Now let’s alternate between subtracting and adding digits of it (note: important you start with subtraction, or alternatively, you can start with addition if you turn the first digit into negative):
9 - 8 + 4 - 2 + 3 - 6 = 0 (or, you can do -9 + 8 - … + 6 = 0)
We got zero, which means that number is divisible by 11!
If you get 11, 22, 33 etc, that also means it’s divisible by eleven, because 1 - 1 = 0, 2 - 2 = 0, 3 - 3 = 0 … same if you get 121 (again, 1 - 2 + 1 = 0) or any other number divisible by 11.
I taught myself my nines table this way. If I had a number multiplied 9, I’d subtract one from the original number and then count from there up to nine (3x9=27 for example. 3-1=2, and 2 to 9 is 7). As a tutor it was a hit with a lot of students too.
I can get the confusion though, mostly because it’s shaped weirdly. Why is it a ring with all these spikes? Why is the 9 at the bottom? Why is the division symbol just on the left? I’m guessing you can spin it or something, but this doesn’t really look like an equation.
Like, I get that it shows times tables, but I’m still confused as to what on Earth is going on with the design lol
I'm just guessing here, but I would assume the back side (not shown) has the numbers 1 through ten on it. So you turn to a larger number, divided by 9, turn it over and you have the answer.
That's exactly how it works. You spin the outside it lands on a number you divide that number by 9 and the answer is on the back. They come in addition, subtraction, multiplication and division.
It's easy to tell all of the numbers are divisible by nine. It still doesnt explain the point of the arrow w/÷9 placement or why have a gear mechanism to rotate it.
I’m so sorry to tell you this, but that’s usually used by kids these days to count how many times they have done drugs that day. You spin the arrow towards the number.
Back in my day, we took drugs eight at a time. That's why you would buy an "8-ball" of drugs: it was one serving of drugs, containing 8 drugs. Today the drug problem is even worse, and kids take nine drugs at a time, which is why this counter goes up 9 each time you spin it.
Hence the meme '6-7'. It's the start of a coded drugs purchase. The drug purchaser says '6-7'. The drug seller then says '8?' as in 'do you want an 8-ball like the old folks take?' The drug purchaser responds '9!' indicating that the 8-ball will not suffice and they require 9 drugs.
The drugs getting weaker is a factor, I always found as the years go buy drugs got weaker so you end up buying more. Glad to be clean now though, that is a crazy amount of drugs.
Nossir the teacher said I'd have to do math when I growed up and I ain't had to do math once. Could you lift your feet, though, coz I have to mop here, boss said so.
accidentally clicked on your profile and saw something called zatch bell. for some reason i was interested and decided to watch some of the anime, it's really good. thanks for putting me on
idk, i think amitriptyline has its uses, it has gotten my chronic nerve pain down to a tolerable level. absolutely terrible as an antidepressant tho, doesnt do shit for that
All the numbers on the outside are divisible by 9. One cool thing about 9 times tables is that the numbers always add up to 9. Also the first number is 1 less than the number you are multiplying by. So 9 x 8 starts with a 7 ( it’s 8-1) and then you add 2 to seven to get 9, so it’s 72
Related, a cool way my teacher aunt taught me to remember multiplication of 9 is to make a 10 with your two hands.. For 9 x 1 put down the left most finger (or thumb depending on how you made the ten) then count the fingers to the right (there are 9). For 9 x 2 put down your next finger (second from left), count # of fingers before the finger you put down (1) then the number of fingers after the finger you put down (8), put together and it’s 18. Then repeat going to 3, 4, etc.
I'm decades old and just realized something about multiplying by nines.
Instead of multiplying by 9 just multiply the number by 10 and then subtract that number. So, 9x8 is 80-8, or 72. 9x230 is 2300-230 or 2030. I never realized that.
Got another one for you, or anyone else that might not know. To multiply 9s on your fingers, hold out your hands, palms away from you, and count fingers left to right until you reach the number you want to multiply by 9. For example, 9x3: count your pinky for 1, ring finger for 2, middle finger, 3. Bend your middle finger down. You have 2 up fingers to the left of the bent digit, 7 to the right. 9x3=27.
I'm sorry you had to find out this way.
That's math paraphernalia.
Your kid took some math.
If they keep doing math you'll see them. progressively become someone you hardly recognize or understand anymore.
I hope you both can find recovery but the odds are like 1 in some really big number.
My thoughts and prayers go out to you.
Well prayers anyway
Practicing times tables, but in this case, for division. Think flash cards. My kids have something similar. If you follow the circle around starting at the 9, it increases by 9 (1x9, 2x9, 3x9, etc) up to 10x9.
It starts off pretty innocently with addition and subtraction. But unfortunately those math concepts are a gateway into multiplication and sadly in this case division.
It’s obviously a tool for learning multiplication by 9 and numbers divisible by 9.
Also why don’t you just ask your kid? Is that really that difficult to talk to your kid?
Also your kid is the man of the house now. He/she apparently has more of an ability to do basic math than you do since you can’t recognize what this is.
It is a multiplication chart fidget spinner. The answers are on the backside of it. I have a set of them myself. You have one for each multiple, so if you have the 36 /9, you flip it over, it should be pointing to a 4 and I'll say 9 × 4 on the other side.
Pretty sure that's a heroin bong. Those damn Democrats give them out to all the kids. Burn it anyway, those are Arabic numbers on it, that's the first step towards Shakira law.
I have a sneaking suspicion that all of these numbers are divisible by 9, and you don't know your times tables.
OP is the kid
Im sorry to break it to you, your kid is on math...
Underrated comment.
Math, not even once
[removed]
[removed]
He is 35 in this ad.
He smoked cigarettes.
Cigarettes? He only smoked one. Don’t smoke, kids.
thanks to that comma i can still smoke kids.
Yeah, but they just don't get you high the way they did in the 70s.
Every cigarette you smoke god gives Keith Richards seven more seconds of life.
Your fing kidding me? He's 35? I'm older then diabetes guy! Holy..
The word you're looking for is than.
No, he's older, and then he's diabeetus guy
Thems is fangers
Yeah, I'd be concerned seeing a child with fingers like that. Like, what would they be feeding him? Ground beef, 15 raw eggs, with a pound of sugar.. Maybe a sprinkle of salt? LMFAOO
his siblings?
If he’s expecting us to teach him math he’s mistaken.
I mean, yeah, obviously, but whats the purpose of this? Is it just an education writing on a fidget spinner?
Edit: Oh, there are writings on the other side. Its a mini calculator for 9 multiplication/division.
Device helping with multiplication/division of 9 is like the second most useless tool I can imagine right after tool that helps with multiplication/division of 10's.
And genuinely looking at this tool it feels like it takes more brain power to use this rather than.. you know, calculate it.
If spending a few bucks on a gimmicky tool helps kids memorize stuff with fewer years let them
Don't kids today know the ten finger trick?
an easy well to tell is to just add the two digits together. if it add up to 9, it's divisible by 9
for example:
18: 1+8=9 ✓
27: 2+7=9 ✓
36: 3+6=9 ✓
etc
Even more fun, if it is a large number, like 494784, and the sum of the digits are more than one digit, 36, do it again and it will be 9 if the original number was divisible by 9.
Im more of a 5318008 guy myself >_>
A fellow man of culture 🧐
I had a mastectomy and a friend made me a shirt with 55378008 🤌🏻
Fun fact: Yours is the only of those 3 jokes that is still divisible by 9.
Had to look up to see if it exists as a license plate, but of course.
Please put an NSFW tag on this. I was on the train and when I saw this I had to start furiously masturbating. Everyone else gave me strange looks and were saying things like “what the fuck” and “call the police”. I dropped my phone and everyone around me saw this. Now there is a whole train of men masturbating together at this. This is all your fault, you could have prevented this if you had just tagged this post NSFW!
You can do the same to find out if a number is divisible by 3 if the digits add up to 3. The algorithm can be repeated untill you can tell at a glance if the number is divisible.
There are simple rules (except for 7, that one is weird) to check divisibility up to 12.
2 if the last digit is divisible by 2
3 if the sum of all the digits is divisible by 3 (this can be done multiple times until it's easily verifiable, e.g. 167415 -> 1+6+7+4+1+5 = 24 (it is divisible by 3 but to further the example) -> 2+4 = 6)
4 if the last 2 digits are divisible by 4
5 if the last digit is 5 or 0
6 if the number is divisible by 2 and 3
8 if the last 3 digits are divisible by 8 (this one is not as straight forward but still useful)
9 if the sum of all digits is divisible by 9 (the algorithm can be repeated as in the case of 3)
10 if the last digit is 0
11 if the difference between the sum of the odd position digits and the even position digits is 0 or divisible by 11 (algorithm can be repeated but it's somewhat time consuming)
12 if the number is divisible by 3 and 4
7 this is kind of weird and not very easy to do on the fly but it exists. Take the last digit and double it. Subtract it from the original number sans the last digit and if the result is divisible by 7 then so is the original (e.g.1036 -> 103 - 12 = 91 -> 9 -2 = 7)
Just blew my mind
Now check this one out:
Let’s say we take a number 984236.
Now let’s alternate between subtracting and adding digits of it (note: important you start with subtraction, or alternatively, you can start with addition if you turn the first digit into negative):
9 - 8 + 4 - 2 + 3 - 6 = 0 (or, you can do -9 + 8 - … + 6 = 0)
We got zero, which means that number is divisible by 11!
If you get 11, 22, 33 etc, that also means it’s divisible by eleven, because 1 - 1 = 0, 2 - 2 = 0, 3 - 3 = 0 … same if you get 121 (again, 1 - 2 + 1 = 0) or any other number divisible by 11.
I figured this out in third grade when we were memorizing multiplication tables. Blew. My. Damn. Mind. I've loved math ever since.
You can also make it easier do this with big numbers by just eliminating every 9 and 0 you find. Like 4909392 becomes 432 which is 4+3+2=9
Fun fact if it comes out to 3 6 or 9 its divisible by 3 at minimum
3 6 9, damn she fine
Hoping she can sock it to me one more time
I’ve actually never seen it this way. Our was the finger method for easy memory. I like this way. Gonna show my 8y/o
I taught myself my nines table this way. If I had a number multiplied 9, I’d subtract one from the original number and then count from there up to nine (3x9=27 for example. 3-1=2, and 2 to 9 is 7). As a tutor it was a hit with a lot of students too.
Is this true with all numbers?
Edit: I looked it up and the answer is no and I should’ve known this.
Wow thank you mr that was fun to learn 😊 wow im so impressed 👏 (btw i suck bad at math this is a very lovely tool!!) 😍
I can get the confusion though, mostly because it’s shaped weirdly. Why is it a ring with all these spikes? Why is the 9 at the bottom? Why is the division symbol just on the left? I’m guessing you can spin it or something, but this doesn’t really look like an equation.
Like, I get that it shows times tables, but I’m still confused as to what on Earth is going on with the design lol
It's a 3dprinted bearing that rolls to show what the top number is divided by 9, more of a fidget toy with a bit of math added in
technically it's not a bearing, it's a planetary gear
Thank you! I knew I was wrong but bearing was the closest thing I could think of! Finally know what it's called haha, I appreciate you
Yeah but 63 divided by 9 is not 18.
I'm guessing the answers are on the other side along with x 9 so that it can be used both division and multiplication tables.
Well damn. It's a good thing I don't math
🤣 I was hoping you'd respond with how dumb I am and give me the reason this toy makes sense 🤣
Who needs a toy for 9's though, 9's are easy to do on your fingers!
I'm just guessing here, but I would assume the back side (not shown) has the numbers 1 through ten on it. So you turn to a larger number, divided by 9, turn it over and you have the answer.
That's exactly how it works. You spin the outside it lands on a number you divide that number by 9 and the answer is on the back. They come in addition, subtraction, multiplication and division.
Bro, you have FINGERS??
I'll bet there something on the back.
but where are the answers at?
It's easy to tell all of the numbers are divisible by nine. It still doesnt explain the point of the arrow w/÷9 placement or why have a gear mechanism to rotate it.
18 / 9 is not 63 last I checked
Yeah but 63 divided by 9 is not 18
Doesn't deserve an award. Explained nothing
Either that or they were just a bit too focused on trying to find a hidden meaning to consider something as obvious as divisibility.
Who remembers the 9’s multiplication table? I use the finger method.
I’m so sorry to tell you this, but that’s usually used by kids these days to count how many times they have done drugs that day. You spin the arrow towards the number.
Back in my day, we took drugs eight at a time. That's why you would buy an "8-ball" of drugs: it was one serving of drugs, containing 8 drugs. Today the drug problem is even worse, and kids take nine drugs at a time, which is why this counter goes up 9 each time you spin it.
Hence the meme '6-7'. It's the start of a coded drugs purchase. The drug purchaser says '6-7'. The drug seller then says '8?' as in 'do you want an 8-ball like the old folks take?' The drug purchaser responds '9!' indicating that the 8-ball will not suffice and they require 9 drugs.
9! is crazy amount of drugs
The drugs getting weaker is a factor, I always found as the years go buy drugs got weaker so you end up buying more. Glad to be clean now though, that is a crazy amount of drugs.
Shrinkflation really hit everything
362,880 is a crazy amount of drugs
r/unexpectedfactorial
Wait, you serious, Clark?
My 5 year old is some big trouble....
A 9-ball?? In this economy?
Doesn't your trust fund manager just have the bowl of drugs on their desk? I grab a few every time I see them.
This gave me a chuckle
Me too. I’m on a work call and had to cough to cover it up
Math, not even once.
Yeah. If you don’t do drugs in multiples of nine you OD instantly. Glad OPs kid is staying safe.
Is there gear with 1-10 on the flip side? With an arrow pointing?
Ouu... Yes, got it. I was just spinning it though it was something else, thanks.
https://preview.redd.it/u9a0cjcvvs6g1.jpeg?width=3000&format=pjpg&auto=webp&s=3a58cc08eb5f1f86a6008e3a4467406784308031
Now it make so much sense. It’s like flash cards.
Spin it a random one. What it to 9x7=?? Guess 63. Flip it over to see if you’re correct.
Spin it to a random one. What is 72/9=?? Guess 8. Flip it over to see if your correct.
Consolidated flash card for 20 equations. Pretty cool honestly.
Consolidated flash cards and turned into a fidget toy all in one
Ya there were so many sassy replies but I couldn’t figure out how you’d make a full math equation with just the first picture.
there are two types of people in the world those who can extrapolate from incomplete data
Not original but still deserves an upvote.
Hearing that term for the first time in years has triggered arthritis in places I didn’t know I had…
Now it makes sense. All the top comments were like "are you dim, can you do basic division?" and I was like "am I stupid? 63 divided by 9 is not 9."
Is this the other side? If so, everything makes more sense now hahaha
63 / 9 = 7. So, it’s mechanical calculator for educational purposes that can only divide.
https://preview.redd.it/qzlzlyzdeu6g1.png?width=1000&format=png&auto=webp&s=4536595cde781701b4485610e67617244bc3e0a5
It also multiplies! Just flip it to the other side :)
https://preview.redd.it/mvs4dbbbeu6g1.png?width=1000&format=png&auto=webp&s=7a580a4dfd051b3bb5fbdc2da294a0a0b3bdafba
How can it only divide? SeriosD just posted the side for setting up multiplication in the post you are replying to!
That’s just dividing but backwards
well it multiplies if you flip it the other way
Rotate the arrow 180 degrees. Now it looks like a six "6."
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Number 9, number 9, number 9, number 9....
Turn me on dead man
Billy Shears
Oh hey the beatles!
Take this, brother, may it serve you well
NINE NINE!
Noine noine
I start with 0 and stop there. I can multiply EVERYTHING by 0 and I know ALL the answers.
Nine is god
It’s a weed grinder. I recommend calling the police and having your child arrested.
And if you are on the US call ICE too, real Americans don't do math.
Cleveland here: That's funny.
Nossir the teacher said I'd have to do math when I growed up and I ain't had to do math once. Could you lift your feet, though, coz I have to mop here, boss said so.
https://www.youtube.com/watch?v=g6cIYDvFS-U
Wtf are you saying? This isn't right, please OP don't listen to him.
When dealing with situations like these, you need to get to the source. Make a deal with the kid and have him spill the name of the pusher!
accidentally clicked on your profile and saw something called zatch bell. for some reason i was interested and decided to watch some of the anime, it's really good. thanks for putting me on
Don't wanna talk kid? Fine. This is Burger King. Have it your way.
*Brings out the rat in a bucket.
Sadly kids are using them for fentanyl now
It’s drugs…
MethadoneAmitriptylineThiamineHydrocortisone the worst drug :(
Amitriptyline sucks
I ain't gonna lie I just looked up drugs names didn't know it was real
They're all real, they're pharmaceuticals. Arguably less favourable to the more naturally produced substances
I just wanted a MATH acronym so I googled drug names so ig that make sense lll
Did not even realize it spelled MATH until I read your comment
idk, i think amitriptyline has its uses, it has gotten my chronic nerve pain down to a tolerable level. absolutely terrible as an antidepressant tho, doesnt do shit for that
In the UK kids take MethadoneAmitriptylineThiamineHydrocortisoneSecobarbital
MATH
Not even once…
M
ethath not even onceDihydrogen monoxide, the silent killer
Always has been...
All the numbers on the outside are divisible by 9. One cool thing about 9 times tables is that the numbers always add up to 9. Also the first number is 1 less than the number you are multiplying by. So 9 x 8 starts with a 7 ( it’s 8-1) and then you add 2 to seven to get 9, so it’s 72
Related, a cool way my teacher aunt taught me to remember multiplication of 9 is to make a 10 with your two hands.. For 9 x 1 put down the left most finger (or thumb depending on how you made the ten) then count the fingers to the right (there are 9). For 9 x 2 put down your next finger (second from left), count # of fingers before the finger you put down (1) then the number of fingers after the finger you put down (8), put together and it’s 18. Then repeat going to 3, 4, etc.
Also looks cool when written out. The digits reverse themselves as you go down the multiplication table:
[0]9
18
27
36
45
[now switch the digits]
54
63
72
81
90
I explained that to my 3rd grade teacher and he was mesmerized
I was a weird kid
Nice planetary gear
I'm decades old and just realized something about multiplying by nines.
Instead of multiplying by 9 just multiply the number by 10 and then subtract that number. So, 9x8 is 80-8, or 72. 9x230 is 2300-230 or 2030. I never realized that.
That’s how I’ve always done it mentally
That's how they always taught it
Got another one for you, or anyone else that might not know. To multiply 9s on your fingers, hold out your hands, palms away from you, and count fingers left to right until you reach the number you want to multiply by 9. For example, 9x3: count your pinky for 1, ring finger for 2, middle finger, 3. Bend your middle finger down. You have 2 up fingers to the left of the bent digit, 7 to the right. 9x3=27.
Are you the finger man? I'm the finger man too.
This is the one I use and just passed it on to my 3rd grader.
Love it
Love this trick. The Almighty created us so that were optimized to solve simple multiplication tables of factors of 9 🙏
It’s cracking me up to think of some divine creator that just wanted more creative ways to do times tables, and so, gestures broadly
Very akin to Hitchhiker’s Guide to the Galaxy
... 2300 - 230 = 2070*
This may not work well if you lose track of subtractions lol
It's a planetary gear and each gear shows how many times it takes that gear to turn until the arrow meets it. 1:9 ratio
That thing is cool as hell
It makes your children smarter when used properly
I'm guessing you don't know your times tables?
I hope you're sitting down.
Your kid is trying to learn math.
That a hard thing to tell to a father
I'm sorry you had to find out this way.
That's math paraphernalia.
Your kid took some math.
If they keep doing math you'll see them. progressively become someone you hardly recognize or understand anymore.
I hope you both can find recovery but the odds are like 1 in some really big number.
My thoughts and prayers go out to you.
Well prayers anyway
Practicing times tables, but in this case, for division. Think flash cards. My kids have something similar. If you follow the circle around starting at the 9, it increases by 9 (1x9, 2x9, 3x9, etc) up to 10x9.
Looks like a 10-sided spinner
Why is it made of gears though? Why does it need to be a mechanism?
Flip it
Bop it
Twist it
The power of 9
Numbers man
The other side have 1-9 on it? Maybe with an “x”?
Top number divided by 9 = bottom number
Who else started singing the song?
Times any number you can find, it all comes back to 9?
Wrong sub, you are looking for r/whatisitcirclejerk
It starts off pretty innocently with addition and subtraction. But unfortunately those math concepts are a gateway into multiplication and sadly in this case division.
It’s obviously a tool for learning multiplication by 9 and numbers divisible by 9.
Also why don’t you just ask your kid? Is that really that difficult to talk to your kid?
Also your kid is the man of the house now. He/she apparently has more of an ability to do basic math than you do since you can’t recognize what this is.
Im sitting here feeling weird about how 63 is divisible by 9.
Did you not learn your multiplication and division tables, OP? My God even Rupert knows what this is.
It’s for measuring amounts of drugs.
I have these in my classroom! Multiplication and division fidget spinners. Terribly noisy but the kids love them
I'm sorry to break it to you, but your kid's on Math.
This cant be real.
Dang! You must be really bad at puzzle solving. There’s a division sign, and a bunch of multiples of 9 lined up
Your kid is doing meth.
Sorry, math.
Edit: gonna print that one, thanks for the idea!
https://makerworld.com/de/models/514212-multiplication-division-fidget-spinners?ref=blog.bambulab.com#profileId-430356
Ask your kid (to teach you your multiplication tables)
Absolutely not, if you can’t figure this one out - you’re cooked
Sorry to inform you that your kid's doing math.
Mfs out here with children who dont know their time tables... Rip OPs kid if they ever ask for help with homework.
Flip it over for the answer.
Funny. Cause 9 times tables are one of the easiest.
09-18-27-36-45-54-63-72-81-90. Palindrome.
0+9=9 1+8=9 2+7=9 3+6=9.... Etc
The two numbers of the sum always equal 9
It is a multiplication chart fidget spinner. The answers are on the backside of it. I have a set of them myself. You have one for each multiple, so if you have the 36 /9, you flip it over, it should be pointing to a 4 and I'll say 9 × 4 on the other side.
Kind of embarassing that you dont know your 9 times table OP
Sorry to say, your kid is on math.
i think you need to have a chat with your kid about gateway math
Pretty sure that's a heroin bong. Those damn Democrats give them out to all the kids. Burn it anyway, those are Arabic numbers on it, that's the first step towards Shakira law.
Wait something doesn’t add up here
https://preview.redd.it/eihgnynygx6g1.jpeg?width=960&format=pjpg&auto=webp&s=09f5ef3d37c0d79c68cd48b5ef7285fc5d09ef51
....and somehow you didn't think the back side was important?
How on earth do you find food for yourself?
Come on man.
It’s drugs
9 times tables you moron
It’s a vape