<![CDATA[This research is development research. Objective Research and development is to describe the process and results of development characterized guided discovery to students of class X are valid, practical and effective to improve students mathematical reasoning. Expected product specification is characterized by the RPP and LKS guided discovery. This study uses Plomp development model (2007) which consists of two stages: preliminary research (initial research) and prototyping (development stage). Based on the results of a small trial, showed that the developed learning tools valid criteria, practical, and effective. So,the product of development can be used as mathematic learning device in sequance and series, because  achieve valid, practical, and effective criteria.]]>
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