Subtraction on the Cranmer Abacus – Rule of 5

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Presentation transcript:

Subtraction on the Cranmer Abacus – Rule of 5 Sara Larkin Math Consultant Iowa Educational Services for the Blind and Visually Impaired Resource Used: Millaway, S. M. (2002). Abacus basic competency: A counting method. American Printing House for the Blind.

Rule of 5 Applies whenever you are moving one bead at a time away from the counting bar, and the rod you are counting on has no more one beads pushed against the counting bar, but does have a five bead set. Move the five bead away from the counting bar Return all 4 one beads towards the counting bar

Practice Problems 8 – 6 17 – 4 38 – 16 49 – 28