Abstract. The purpose of this study was to determine the increase in the understanding of elementary school teachers in developing differentiated learning through training and mentoring methods. This research is a quantitative descriptive study with a one-group pretest-posttest research design. The sample in this study were teachers in Kendal District, Ngawi Regency, East Java Province. The data collection technique used is a test. Data were analyzed using N-Gain. The results showed an increase in teacher understanding in developing differentiation learning. The pre-test showed an average score of 62.07 while the post-test increased with an average score of 85. Thus, teachers can improve their pedagogical skills in developing differentiated learning.
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