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4. Presenting a humble contribution in answering the increasing need for large number of studies in the field of mathematics for the visually handicaped. The suggested unit is considered a step towards designing and using precisely measured progams for such students.
 
4. Presenting a humble contribution in answering the increasing need for large number of studies in the field of mathematics for the visually handicaped. The suggested unit is considered a step towards designing and using precisely measured progams for such students.
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===Background of the study===
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The researcher became aware of the problem of the study through the following resources:
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*The unsuitability of the books studied by the visually handicapped to the nature of their visual handicap.
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*The results of the questionnaire which have shown the lack of a certain framework for teaching mathematics for the visually handicapped.
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*The results and recommendations of the previous studies and international projects in the field of teaching mathematics related to the subject of the study in general and teaching to the visually handicapped in particular, which have shown the importance of teaching mathematics for the visually handicapped in a manipulative method that depends on the rest of the senses.
    
== Key Words ==
 
== Key Words ==
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