Rythmetic is a 1956 Canadian short animated film directed by Norman McLaren and Evelyn Lambart for the National Film Board of Canada.

It is a non-verbal lecture on the subject of mathematics and one of McLaren’s longest animated works.

McLaren wanted to make a truly international film about the inadequacies of communication between peoples of different cultures and languages. To this end, he used the most understood method of communication, Arabic numerals.

Filmed without a camera or microphone and using McLaren’s scratch sound system, the film is a ‘crazy dance’ of mechanical actions and anthropomorphic gestures made by arithmetical figures and symbols; we hear rhythmic music with clicks or scratching sounds made by ink directly painted on the soundtrack. The filling of the background with bright figures against a dark background evoke a classroom blackboard and the teaching process. Classified as an educational film, it is also regarded as a visual and auditory work of art.