Vol. 1 No. 2 (2023) E-ISSN: 2988-5949 Elementaria: Journal of Educational Research https://elementaria.my.id/ 65 Torang Siregar, Ahmad Arisman, Iskandarsyah, Risky Ardian, Awal Harahap Research And Developing Mathematics Knowledge Child Development Perspectives, 2022 Elementaria: Journal of Educational Research E-ISSN: 2988-5949 Vol. 1 No. 2 (2023) DOI: https://doi.org/10.61166/elm.v1i2.1 pp. 65-76 Research Article Research And Developing Mathematics Knowledge Child Development Perspectives, 2022 Torang Siregar, Ahmad Arisman, Iskandarsyah, Risky Ardian, Awal Harahap UIN Syekh Ali Hasan Ahmad Addary, Padangsidimpuan, Indonesia Copyright © 2023 by Authors, Published by Elementaria: Journal of Educational Research. This is an open access article under the CC BY License https://creativecommons.org/licenses/by/4.0/ Received : September 07, 2023 Revised : October 08, 2023 Accepted : November 20, 2023 Available online : December 17, 2023 How to Cite: Torang Siregar, Ahmad Arisman, Iskandarsyah, Risky Ardian, & Awal Harahap. (2023). Research And Developing Mathematics Knowledge Child Development Perspectives, 2022. Elementaria: Journal of Educational Research, 1(2), 65–76. https://doi.org/10.61166/elm.v1i2.11 Corresponding Author, E.mail: torangsir@uinsyahada.ac.id (Torang Siregar) Abstract. Proficiency in mathematics is critical to success academically, economically, and in life. Greater success in math is related to entering and completing college, earning more in adulthood, and making more optimal decisions concerning health. Knowledge of math begins to develop at a young age, and this early knowledge matters: Knowledge of math at or before school entry predicts outcomes in math and reading across primary and secondary school. More than one children struggle to learn math. For example, only 60% of fourth-grade and 55% of eighth-grade students in the United States performed at or above proficiency in mathon the 2020 National Assessment of Educational Progress, and proficiency rates were even lowerfor African-American and Hispanic children and for children from low-income homes. More than one students do not master challenging math content. Developing strong knowledge about mathematics is important for success academically, economically, and in life, but more than one children fail to become proficient in math. Researchon