This study aims to design Student Worksheets, especially mentally retarded in Junior High School (especially in Special Needed School of Bhakti Kencana Berbah) on multiplication of natural numbers. The valid worksheet will be used to teach the material so that students understand the multiplication concept easily. The context used in this study is fruits satay. The many rows of fruits arranged to carry the concept of multiplication, from repeated summation until students conclude the concept of multiplication. This study uses Research and Development (R & D) in designing worksheets for mentally retarded students. The worksheet created will be developed to be applied in the class. In addition, the researcher hopes that it can be applied to normal students who have difficulty in multiplication learning or as a beginning to teach the multiplication concept. © 2019, International Journal of Scientific and Technology Research. All rights reserved.
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