Abstract
The purpose of this study is to describe the results of the analysis of the ability to understand cognitive mathematics in the material "angles" when using video learning with an online system in class IV B SDN Pintukisi Sukabumi City. The research method used is descriptive qualitative method. Data collection techniques used were interviews and documentation. The writer acts as an instrument for collecting data. Data analysis techniques used are according to Miles and Huberman which consists of data reduction, data display, and Conclusion Drawing/Verification. The research subjects used were grade IV B students in the 2019/2020 school year. The number of students is 20 people. The results showed how to understand mathematics in the angles material, 2 students got the highest grades and 12 students got grades less than KKM.The results revealed that the cognitive understanding ability of students in class IV B based on the first indicator can be categorized high, the second indicator is categorized high, and the third indicator can be said to be very low.
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