A cheat sheet or crib sheet is a concise set of notes used for quick reference. "Cheat sheet" may also be rendered "cheatsheet".

Cheat sheets are so named because they may be used by students without the instructor's knowledge to cheat on a test. However, at middle levels of education where rote memorization is not as important as either basic education or intense graduate studies, high school or undergraduate students may be permitted to consult their own notes during the exam (which is not considered cheating). The act of preparing a so-called cheat sheet is also an educational exercise, thus students are typically only allowed to use cheat sheets they have written themselves. In such usage, a cheat sheet is a physical piece of paper, often filled with equations and/or facts in compressed writing. Modern students often print cheat sheets in extremely small font, fitting an entire page of notes in the palm of their hands during the exam.

The term can also apply to the fully worked solution for exams or work sheets normally handed out to university staff to ease marking.

Danica Mae McKellar (born January 3, 1975) is an American actress, academic, and education advocate. She is best known for her role as Winnie Cooper in the television show The Wonder Years, and later as author of three popular non-fiction books: Math Doesn't Suck, Kiss My Math, and Hot X: Algebra Exposed, which encourage middle-school girls to have confidence and succeed in mathematics.

Born in La Jolla, California, McKellar moved with her family to Los Angeles when she was eight. Her mother Mahalia is a homemaker; her father Christopher is a real estate developer. Her family is "a big mix of Western Europe": Her mother's ancestry is Portuguese (via the Azores and Madeira islands); her father's ancestry is Scottish, Irish, French, German and Dutch. McKellar and her sister Crystal McKellar (who is loosely named after their dad) both maintained professional acting careers as children, but with a strong emphasis on education as a priority. As a result, Crystal became a corporate lawyer (her family nicknamed her "Legally Blonde" because of her hair color), while Danica majored in mathematics. Danica and Crystal also have two half-brothers, Chris Junior and Connor McKellar.

Charlotte "Charlie" Ray Rosenberg (born March 8, 1992) is an American actress.

Ray was born in New York City. Since the age of 3, Ray has been studying jazz and tap dancing at Broadway Dance Center and Peridance, hip-hop at Kelly Peter Dance and ballet at Joffrey Ballet. In 2008, she played Sally Bowles in a controversial school production of the musical Cabaret.

She also has sang in The Dalton School's a cappella group "Sweet n' Low". Ray is the younger sister of filmmaker Jackson Waite of California. Charlie was voted class president in 5th grade.

She is most well-known for her role as Rosemary Telesco in the film Little Manhattan opposite Josh Hutcherson. She now attends Northwestern University as a theater major in the class of 2014. In September 2011, she was featured in the ensemble of the classic Steven Schwartz-written musical, "Pippin," in historic Shanley Pavilion.