
 items  Items no  r  Cronbach α 
1  selfconfidence in mathematics  5  3, 7, 11, 15, 18  0.505  0.556  0.93  0.931 
2  perceived value of mathematics  5  4, 8, 12, 16, 19  0.529  0.67  0.928  0.93 
3  mathematics enjoyment  5  1, 5, 9, 13, 17  0.635  0.791  0.925  0.928 
4  mathematics motivation  4  2, 6, 10, 14  0.557  0.708  0.927  0.93 