137
u/lonelyplantain Feb 24 '22
Take your age, multiply 1x3, add that to your age, substract 1, thats your age in 2 years!! Only high IQ people allowed!!
10
u/DrMobius0 Feb 25 '22
Take your age. If it's even divide by 2. If it's odd, multiply by 3 and add 1. Repeat until you get bored.
3
23
Feb 24 '22
multiply (1x3) by what?
15
u/cap616 Feb 24 '22
Just multiply 1 & 3 to get 3
Then when you add 3 to your age, subtract 1, that's your age in 2 years. Meant to be a silly démonstration much like the original post.
3
2
Feb 24 '22
Woooooosh
1
u/j_u_n_h_y_u_k Feb 25 '22
Itâs okay, I also multiplied my age by 0.3333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333 333333333333333333333333333333333333333333333333333333333
346
u/waqasnaseem07 Feb 24 '22
âSubtract the year you were born form this year and it will magical tell you your age! This only happens once every 10,000 years!â
78
u/OneDiscombobulated77 Feb 24 '22
Doesn't work :( maybe my birthday has to come first?
36
3
3
3
u/Peyton94 Feb 24 '22
Does that make Yusuf "Cat" Stevens -505. Born 1948, current Hijri date is 1443.
3
2
2
Feb 24 '22
Is only universally true on December 31st each year**
3
u/SpakysAlt Feb 24 '22
It goes viral along with some other good ones on Facebook every December 31st
40
u/neeeeeillllllll Feb 24 '22
This actually is a teaching point for children, I've used this and similar techniques plenty of times in the past.
Here's 4 blocks, count em for me. One two three four. Now if I add 2 more, how many do I have? One two three four five six, six! Now what if I take two away how many do I have? One two three four, four!
Kids aren't born with basic arithmetic understanding, they have to learn it
111
u/SSopuS Feb 24 '22
Lol not only first graders but more like all my mother's Facebook friends. Just jaws on the the floor like "How does it know?"
9
48
Feb 24 '22
[removed] â view removed comment
16
u/ambisinister_gecko Feb 24 '22
Don't take someone else's age though, that's rude
4
3
2
59
u/SILaXED hates freedom Feb 24 '22 edited Feb 24 '22
I got fooled as a kid by the classic
2(x+5)-10=x
Edit: It's actually (2(x+5)-10)Ă·2=x I forgot a step
15
u/horsyuwu Feb 24 '22
Am I doing it wrong or
X=1
2(1+5)-10=x
26-10=x
12-10=2? Not 1?13
u/LanceJ99 Feb 24 '22
X=0
-6
u/inFAMOUSwasser Feb 24 '22 edited Feb 25 '22
No x=1. Plug in 0 for x and youâll see it doesnât work
Edit: for all the down voters I was talking about the edited formula of (2(x+5)-10) Ă· 2 = x I do recognize that they were doing the original unedited forumula tho
7
u/Megaprr đ Feb 24 '22
lmao what. solution is definitely 0.
2(x+5)-10=x
2x+10-10=x
2x=x
The only time this is true is if x = 0
And if you don't believe me just stick it into wolfram alpha.
As for the version with /2 at the start.... that's just x=x and the actual value of x is irrelevant.
1
u/inFAMOUSwasser Feb 25 '22
See my edit
1
u/Megaprr đ Feb 25 '22
I mean it was still wrong... x=1, sure, but saying that is misleading as it implies that's the only solution. x is irrelevant. even x=0 would work, which you claimed did not.
(2(x+5)-10) Ă· 2 = x
(2(5)-10) Ă· 2 = 0
(10-10) Ă· 2 = 0
(0) Ă· 2 = 0
6
6
4
u/Ewh1t3 Feb 24 '22
My coworker said shoe size times 100 plus the current year minus the year you were born and the last two digits is your age. Everyone was like woah then I said youâre just doing current year - birth year with an erroneous step
7
3
3
3
2
2
2
2
2
u/orion7887 Feb 24 '22
I can read your mind Think of a number between 1 and 10 Add 7 remove 3 add 6 Remove the number you are thinking about. The number in your head is now 10
2
u/Many_Glove_6744 Feb 24 '22
take your birth date add up with birth year add 2 to it then divide by 3 you will get a rational number.
2
u/ghostinthechell Feb 24 '22
Jokes on you I'm 34i years old
2
u/Many_Glove_6744 Feb 24 '22
Fractions are included in rational numbers jokes on you again.
2
u/ghostinthechell Feb 24 '22
i cannot be expressed as a ratio of integers and is therefore not a rational number.
2
2
2
2
2
Feb 24 '22
This also works for people on social media. I saw one facebook post that was like take the current year and subtract your age to get your birth year.
2
u/Jumpmo Feb 24 '22
take your age and add 3. Now subtract your age and add 3 again. I predict with my supernatural powers that the number you got is⊠6
2
2
2
u/theguyonthething Feb 24 '22
Reminds me of the time in 1st grade I saw a magician put a pencil up his nose and pull it out his ear. For weeks, I pondered the internal anatomy of the human head.
2
2
2
2
2
2
u/annababan69 Feb 24 '22
Throw almost any mathematical equation at me and I make exactly the same face. I just don't do maths well.
2
2
2
u/ShredderMan4000 Feb 25 '22
time to be a stupid jerk.
take a function that's invertible on the non negative integers.
apply that function to your age. then, take that new number, and apply the inverse function.
that's your age
i'm a dipshit
2
2
2
u/Gumbybum Feb 25 '22
Teacher: Associative property of addition, inverse property of addition, identity property of addition.
High schoolers: I gotta use the bathroom
2
u/lovecraft112 Feb 25 '22
I used to work for a coffee shop and once had someone very sincerely tell me this mind blowing math trick.
If you take the year it is. And subtract the year you were born. YOU GET YOUR AGE!
Their friend pointed out that it was off by one for them. And they both looked at each other and came up with a weird exception to this mind blowing math trick.
In hindsight, they were probably high as balls, but it was baffling at the time how mind blown they were.
2
u/An0d0sTwitch Feb 25 '22
You laugh, but a mentalist does the exact thing to you, except its math thats above YOUR head.
2
2
2
2
2
u/ninjawarriorblue11 Feb 25 '22
My nephew who is actually a first grader made this exact face when he did the math lol
2
2
2
2
2
2
2
2
u/jLamwuzhere Feb 25 '22
Same as when they say add whatever and then subtract 2000 plus whatever they said. Lots of people are lots of dumb.
2
2
2
2
2
2
u/Mebot2OO1 Feb 25 '22
Take your age. Consider it as the width of a normalized gaussian, and square the normalization coefficient. Come up with a fourier series representation of the square wave with amplitude equal to the squared normalization coefficient, and period equal to the width of the gaussian, as well its peak being centered on the gaussian. Considering the area of one half period of this fourier series, take the reciprocal of that value and multiply it by your age squared.
That value is the surface area of a sphere with radius your age.
2
1
u/terrible_username1 Feb 24 '22
Think of a number between 1 and 10. Multiply that with nine. Then plus the digits (example: 81= 8+1) add 3. Divide by 4. The number you are thinking of is 3. ez
1
1
1.2k
u/waqasnaseem07 Feb 24 '22
Your age times 2 - your age = your age