This paper reports selected findings from a study of number sense proficiency of students aged 13 to 16 years in a state in Malaysia. A total of 1756 students, from thirteen schools in a state in Malaysia participated in this study. A majority (74.9%) of these students obtained an A grade for their respective year-end school examinations. The design for this study was quantitative in nature where the data on student's sense of numbers was collected using Number Sense Test adapted from McIntosh et. al., (1997). The results from this study indicate that students obtained a low percentage of success rate ranging from 37.3% to 47.7% across the levels. There was no significant difference in the results between Secondary 1 students and Secondary 2 students and also between Secondary 3 students and Secondary 4 students. In terms of gender comparison, although the male students obtained a higher score than their female counterparts, this difference was only significant among the Secondary one student's. It seems that an over reliance on paper and pencil computation at the expense of intuitive understanding of numbers is taking place among these students. (Contains 19 tables.)