Sia SP, Abu Bakar K. Improving the Addition of Preschool Children Through the use of Concrete and Visual Materials: Meningkatkan Kemahiran Operasi Tambah Kanak-kanak Prasekolah melalui Penggunaan Bahan Konkrit dan Visual. JPAKK [Internet]. 2022 Aug. 9 [cited 2024 Nov. 22];11:103-1. Available from: https://ejournal.upsi.edu.my/index.php/JPAK/article/view/7156