Rythmetic -- Film Description:
"An animated film by Norman McLaren and Evelyn Lambart that endows arithmetic with lively humor. The screen becomes a numerical free-for-all as digits meet in playful encounter, add and subtract, jostle, attack, and elude one another."
-- National Film Board of Canada

Source:
National Film Board of Canada. "NFB -- Rythmetic." National Film Board of Canada. http://onf-nfb.gc.ca/en/our-collection/?idfilm=10570.