Validation of discovery learning-based to increase the ability of elementary students problem solving skills

This study aims to develop learning to produce mathematical learning device products based on discovery learning that are able to improve elementary students' problem solving abilities that are valid, practical, and effective. The specific target to be achieved is to produce a product in the form of Teaching Materials for mathematics discovery learning to improve problem solving skills of elementary school students and RPP as a companion to the use of teaching materials. his is a development research with 4D models consisting of Define, Design, Develop, and Disseminate. Development is done up to the develop stage to produce valid learning materials. The revision process according to the validation's assessment and suggestion, a valid mathinstructional material based on discovery learning in terms of content and construct is obtained. The validity of teaching materials is obtained through expert assessment and revision based on expert advice until the validity level of RPP and Teaching Materials designed is 3.45 and 3.42 with valid categories.