Sarifah, I. “INCREASING THE COMPETENCE OF TEACHERS OF SD KEPULAUAN SERIBU DKI JAKARTA PROVINCE THROUGH ASSISTANCE IN DEVELOPING PERFORMANCE ASSESSMENT INSTRUMENTS IN MATHEMATICS LEARNING”. International Education Trend Issues, vol. 1, no. 2, Aug. 2023, pp. 219 -31, doi:10.56442/ieti.v1i3.238.