Zero, the troublemaker

Uses animated numerals to show the role of zero in addition and subtraction, and its special use as a place holder for other numerals. Indicates how useful zero can be in both small and large numbers. Suitable for lower and middle primary levels.

Copyright

Sources

  1. 16mm Filmography (legacy record) — title, description, catalog record
  2. U.S. Copyright Office, Catalog of Copyright Entries (renewals, 1970–1978) — copyright