Paths to Literacy

for students who are blind or visually impaired

APH Cranmer Abacus video

Photo of fingers using abacus

Susan Osterhaus of Texas School for the Blind and Visually Impaired presents a two-part video tutorial on using the APH Cranmer Abacus to teach Prime Factorization.

Posted on February 21, 2012
Updated on: January 30, 2019