Language as a cultural element influences Aboriginal pupils' mathematic performance. This study examines the utility of oral test in native language for computation and word problem mathematics items using score comparability. The sample includes 230 Grade 5 Orang Asli pupils from eight Malaysian primary schools in two states. By employing equipercentile linking using RAGE-RGEQUATE, the oral mathematics test was easier and more helpful, especially in native language for word problem items. The oral mathematics test is a valid measure for Orang Asli pupils in capturing their mathematical ability by reducing language as an erroneous secondary construct while assessing the primary dimension, which is mathematics knowledge. In addition, incorporating Aboriginal pupils' cultural elements can mitigate their challenges in learning Western mathematics.