Effectiveness of Integrating Science Process-Skills in Teaching Mathematics on Students’ Achievement in Secondary Schools in Tharaka-Nithi County, Kenya. International Journal of Academic Research in Progressive Education and Development, [S. l.], v. 6, n. 4, 2017. Disponível em: https://ijarped.com/index.php/journal/article/view/360. Acesso em: 18 mar. 2026.