There are quite a few methods for multiplying large numbers together. Watch this video to learn about Long Multiplication and how it compares to some of the others. Then download the software to get practising.

  • 2:30 Commutative property
  • 3:00 Distributive property
  • 4:15 Box/Grid method
  • 5:00 Lattice method
  • 6:00 Long multiplication / software demonstration
  • 9:00 Two tips

Music: "Mr Fiddlestick" by Ben Thomas, used with permission.

Film/TV Clips: The Hitchhiker's Guide to the Galaxy (1981), Andrex advert, Sesame Street, Willy Wonka & the Chocolate Factory (1971).

Sound clips: Pulp Fiction (1994), Twin Peaks (1990) and, from

  • Eating crunchies -
  • Falling shoe boxes -
  • Chairs scraping -

long multiplication icon Long Multiplication software (zip)

Help icon Help file