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3 + 2 = 1 

A mathematical statement most grades K–2 students would disqualify as being an equation, thus revealing their partial understanding of the meaning of an equals sign, which has different meanings.
What percentage of elementary math students (and their teachers and parents) would claim that statements like 1 + 3 = 2, 3 + 2 = 1, and 2 × 3 = 1 aren’t equations, because the sum or product is incorrect?
3 + 2 = 1 by Fasters May 9, 2022
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1 + 2 + 3 = 1 × 2 × 3 

The nontrivial solution to the equation a + b + c = a × b × c, where a, b, and c are positive integers—the sum and the product of three whole numbers are the same.
Besides 1 + 2 + 3 = 1 × 2 × 3, the numbers 1, 2, and 3 form the set of three integers such that each divides the sum of the other two, and their reciprocals show that the number 1 can be expressed as the sum of three unit fractions: 1 = 1/2 + 1/3 + 1/6.
If you see a phone number with a +234 in it, you shouldn't pick it up because it's most likely a 419 scammer from Nigeria.
+234 by nilethe146 February 11, 2015

2 + 2 = 5 

A reference to 1984; signifies somebody has been completly whipped/controled to the point that the person believes/will do anything the whipee/controler tells them. Usually used to mock a friend who has decided to pass up a night with the friends to go do something incredibly gay with their signifcant other.

It's also the title to a radiohead song
Pat: well i would stay and drink with you guys but Heather beeped me and said she needs me to go help her pick out a new purse.
Paul: Yeah, you go do that you fricken douche.
Luke: Hey Pat, wtf does 2+2 equal again?
2 + 2 = 5 by el chat May 13, 2005

1 + 2 = 3 

The solution to the equation a + b = c, where a, b, and c are consecutive integers; or where b = a + 1 and c = a + 2.
If 1 + 2 = 3 and 4 + 5 + 6 = 7 + 8 are the first two terms of a sequence of equations, what is the sum of the third equation in the pattern?
1 + 2 = 3 by Fasters May 7, 2022

2 + 2 = 5 

Part of the Book "1984", It shows how Big Brother has brainwashed the people so much that they belive 2+2=5.
"... 2+2=4 dude"
"pft not in 1984 it isnt"
2 + 2 = 5 by Fuji May 13, 2005

2 + 2 = 5 

A joke that nerds usually make about the rounding of numbers. If you do 2.3 rounded (2) + 2.4 rounded (2), you get 4.7 which rounds to 5.

And because humans are imperfect, we are never able to make exact precision on anything. This means, that anything we do, we are doing some kind of rounding/estimation at some point. So, this means that 2 + 2 = 5 but only for very large values of 2.
2.36 rounded = 2
2.44 rounded = 2
4.8 rounded = 5

2.36 + 2.44 = 4.8

2 + 2 = 5 (when all numbers are rounded)
2 + 2 = 5 by Eddie Pyune September 29, 2005