items

Items no

r

Cronbach α

1

self-confidence 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