I have a file in my email titled "SAT Fails" filled with photos of student work with errors such as x + 3 = 10 with x=8. Or, 2x * x = 3x. It’s either utterly comedic or a Hall of Horrors, depending on your perspective.
Years ago I worked with a remarkable young woman, a terrific student, real math whiz, and a total pistol. Upon pointing out her error that, in fact, 2 + 6 does NOT equal 12, she pursed her lips, got a far away look in her eyes, and muttered one of the greatest insights ever uttered in the history of test prep: