Table 2.
Descriptives for the domains of the Arithmetic Tempo Test and Working Memory tasks for grades 2 through 6
| Grade 2 | Grade 3 | Grade 4 | Grade 5 | Grade 6 | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| n | mean | SD | n | mean | SD | n | mean | SD | n | mean | SD | n | mean | SD | ||
| Addition | T1 | 777 | 14.87 | 4.45 | 789 | 18.64 | 5.15 | 769 | 21.70 | 4.94 | 793 | 25.07 | 4.61 | 836 | 27.67 | 4.75 |
| T2 | 748 | 16.46 | 4.78 | 769 | 19.79 | 4.89 | 823 | 23.69 | 4.83 | 824 | 26.55 | 4.97 | 847 | 28.86 | 4.64 | |
| T3 | 704 | 17.33 | 5.09 | 686 | 21.07 | 5.33 | 719 | 24.60 | 4.88 | 709 | 27.23 | 4.73 | 764 | 29.40 | 4.71 | |
| Subtraction | T1 | 780 | 11.99 | 4.50 | 789 | 16.36 | 5.23 | 769 | 19.20 | 5.12 | 793 | 22.12 | 5.09 | 837 | 25.34 | 5.15 |
| T2 | 733 | 13.64 | 4.85 | 769 | 17.77 | 5.34 | 823 | 20.68 | 5.09 | 824 | 23.67 | 5.34 | 848 | 26.20 | 5.21 | |
| T3 | 703 | 14.82 | 5.34 | 686 | 18.51 | 5.44 | 718 | 21.35 | 5.21 | 709 | 24.12 | 5.17 | 764 | 26.24 | 5.41 | |
| Multiplication | T1 | - | - | - | 787 | 16.18 | 4.64 | 769 | 19.46 | 5.29 | 793 | 22.28 | 5.51 | 837 | 25.12 | 5.73 |
| T2 | - | - | - | 769 | 18.20 | 4.98 | 823 | 20.65 | 5.34 | 823 | 23.33 | 5.71 | 848 | 26.49 | 5.86 | |
| T3 | - | - | - | 685 | 18.56 | 5.20 | 718 | 21.13 | 5.43 | 709 | 23.72 | 5.66 | 764 | 25.81 | 6.07 | |
| Division | T1 | - | - | - | 767 | 7.98 | 5.29 | 769 | 12.67 | 5.97 | 793 | 16.53 | 6.63 | 837 | 20.90 | 7.21 |
| T2 | - | - | - | 767 | 10.93 | 5.72 | 823 | 14.86 | 6.49 | 822 | 18.45 | 6.79 | 848 | 22.54 | 7.32 | |
| T3 | - | - | - | 682 | 11.81 | 6.11 | 717 | 16.18 | 6.43 | 708 | 19.48 | 6.85 | 764 | 22.27 | 7.89 | |
| Visual-spatial WM | 754 | .56 | .18 | 745 | .65 | .17 | 744 | .71 | .15 | 787 | .74 | .13 | 800 | .77 | .13 | |
| Verbal WM | 727 | .46 | .15 | 641 | .51 | .14 | 725 | .56 | .12 | 698 | .58 | .13 | 708 | .62 | .13 | |
T1 = beginning of school year, T2 = mid school year, T3 = end of school year, WM = working memory