Over the past 30 years, it has become clear that there are two major clusters of learning difficulties. The most commonly known is reading disability, sometimes called dyslexia. Another equally prevalent but less commonly known disability is arithmetic (mathematics) disability...

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A research study, conducted at a school where the children were from poor socio-economic backgrounds, compared the success of children of similar backgrounds. The children had been randomly placed in three first-grade classrooms. Their teachers had taught in this school for many years....

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