This study aims to determine the effect of Smart Box Media on basic mathematical skills. The research design is pre experimental with a one group pre test and post test model. The sample was selested using purposive sampling. The subjects of this study were 10 children aged 5 to 6 years at Pertiwi Gondowangi Kindergarten, Sawangan District, Magelang Regency. This study used a quantitative approach with an experimental design. Mathematical ability was measured using an observation sheet. Data analysis using Wilcoxon analysis showed that the significance value was 0,000 < 0,05 , so Ho was rejected and Ha was accepted, meaning that there was a difference between the pre test and post test result. It can be concluded that Smart Box Media Affects the Basic Mathematical Skills of Children Age 5- 6 Years.
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