“IMPACT OF DECAMATH PUZZLE ON ADDITION OF 1- DIGIT BY 1- DIGIT NUMBERS OF GRADE 1 LEARNERS”. Ascendens Asia Singapore – Bestlink College of the Philippines Journal of Multidisciplinary Research, vol. 7, no. 1, Jan. 2026, https://ojs.aaresearchindex.com/index.php/aasgbcpjmra/article/view/15554.