Abstract:
The objectives of this research were 1) to construct and verify the quality of number sense test for primary 6 students, 2) to construct norms of number sense test for primary 6 students. The simple of this study was 786 primary 6 students who have been studying at Office of the Basic Education Commission Nakhonpathom Province, academic year 2020. A simple random sampling was used to Two-stage cluster sampling. Tests create by researcher comprised of 4 selective this test 24 item for number sense as follows: 1) meaning of numbers 2) understanding equivalence with numbers 3) comparison of numerical expressions 4) recognizing the relative effects of operations on numbers and estimate 5) using benchmarks appropriately and 6) mental arithmetic. Data were analyzed by content validity, difficulty, discrimination, reliability from Kuder - Richardson procedure and normalize T- score. The research results were as follows. 1) The consistency index of the face validity of number sense test items was between 0.60 and 1.00, the diffculty was between 0.27 and 0.60, the discrimination was between 0.22 and 0.67, the reliability from Kuder - Richardson procedure of was 0.77. 2) The normalize T- score of the of number sense test ranged from T36.10 to T79.20 covering raw score ranged from 4 to 24.