
Any statement, usually involving multiple objects + Mathematics = This trope
This is when a statement regarding realworld things is expressed as a mathematical equation, usually in the form of x + y = z to quickly tell you what you get when you mix x and y. Also common is writing an elaborate deduction on a blackboard or thought bubbles, but substituting a few terms, including the result, with pictures related to whatever the character is scheming.
Try not to think too hard about the implications of some of these. For example, Quantum Mariah Carey Problem is equal to this trope plus Fridge Logic.
Parallel to E = MC Hammer, when used to convey a setting or a character's skills, and may be derivative of Writers Cannot Do Math.
Integral to Troperithmetic. Rebus Bubble is a subset of this.
Not what Physics is.
Examples
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Anime
 It's probably closer to Memetic Mutation, but Batman + Humongous Mecha = The Big O
 Puck has a moment of this in Berserk when he sees Guts collapse. He rushes over to him as he's getting swarmed by weak ghosts, and his wild flailing drives them off. Guts < Monsters, Monsters < Puck, so Puck > Guts.
Comic Books
 The Don Rosa version of Uncle Scrooge sometimes assembles these in his thought balloons.
 Benito Jacovitti, an Italian comic artist, used to draw little comic strips of this type as a gag aside of a main story. Sometimes they were related with verbal jokes (in Italian), sometimes more logical, sometimes nonsenses as in the picture of this entry (bull + lyre = bull with musical strings in the horns). Sometimes he used operations different form the sum: for instance, \sqrt{man}= skeleton.
Literature
 In the Discworld novels (but also referring to the real world, and why time can be lost in bookshops): Libraries are collections of books and books contain knowledge. Knowledge = power = energy = matter = mass. "A good bookshop is a genteel black hole that knows how to read."
 Camel mathematicians also think in these terms.
Let legs equal four....
 The eighth son of an eighth son will always be a wizard. The eighth son of an eighth son of an eighth son is a wizard squared (and a Sourcerer). Even though Fridge Logic points out that if that's going to be any power of a wizard, it ought to be 3/2. But Writers Cannot Do Math.
 This is a bit like the old question about a double hattrick: do 4 successive whatevers count as a double hattrick because there's the first one made up of the first, second and third examples, and a second consisting of the second, third and fourth ones? If so, then the Sourcerer = Wizard^2 argument holds up. An 8th son is just that; it's only when he has an 8th son that said son is a wizard. So it's the extra generation and power of 8 that counts. Doing that again — that is, the wizard having an 8th son — is what makes him a Sourcerer. Put numbers to it: Original 8th son = 1 (unmagical); his 8th son = 8 (wizard); his 8th son = 64 (Sourcerer, and wizard squared).
 In A Wrinkle in Time, Mrs. Who uses her skirt and an ant to illustrate her explanation of the tesseract.
Live Action Television
 In Kenan & Kel, Kenan uses this trope to explain Kel his plan, Kel then tells him he can't add things that aren't numbers.
 Used in NUMB3RS.
Video Games
 The first few levels of Super Paper Mario feature "joke" equations in the background, made up of random numbers and mathematical symbols combined with famous Mario icons such as the Fire Flower and mushrooms.
 In Mickey Mania, when you fight the Mad Doctor, there is a nonsensical equation  featuring Pluto  in the background.
 Alchemy, a series of games for mobile devices including iOS and Android phones and tablets, starts you off with the four classical elements (earth,air,fire,water) and forces you to apply this trope to find all the rest.
Web Comics
Web Original
 The title card for The Angry Video Game Nerd video "Chronologically Confused" features the Nerd in front of a board filled with nonsensical equations and formulae, including at points a Triforce and a drawing of Mario.
 Of particular note is ET=BS.
 The Rocketboom series, Know Your Meme, has its own brand, called Mememath.
 The Nostalgia Chick had the below joke about women equaling time and money therefore they're evil at the start of her "Top Eleven Villainesses."
 Nash does this sometimes, when talking about a complete and stupid disaster. "Once again, it's time to do the math: This + this equals FUCKING THIS!"
Western Animation
Other

