Described are instructional techniques and inexpensive manipulative materials that can be used to teach basic multiplication to blind and partially sighted children. (LH)

In an effort to study the cognitive mapping abilities of blind persons, tactile maps of a school campus were made by ten congenitally blind and ten blindfolded partially sighted high school students. (Author)

Through seriation, verbal seriation, and conservation tasks, investigated blind, partially sighted, and sighted children's understanding of quantity. Subjects were 81 children equally dispersed through these 3 groups. Age range was 4 to 17 years. Found similarity in concept acquisition among three groups that extended beyond quantity conservation…

In the analysis of ability structure and loss of vision, 228 blind persons (153 male, 75 female) heterogenous in respect to chronological age, sex, degree of blindness, age at onset, and duration, were compared to sighted controls. A test battery was administered which included tests for verbal comprehension, mental arithmetic, spatial ability,…