This study sample consisted of children from two learning categories, learning disabled (LD, n = 27, x̄ = 9.08) and not identified as learning disabled (NLD, n = 42, x̄ = 7.46), who were individually ...
Journal for Research in Mathematics Education, Vol. 5, No. 4 (Nov., 1974), pp. 197-211 (15 pages) The effects of negative instances on the acquisition of the mathematical concepts of commutativity and ...
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